Grey's Anatomy

In the midst of a deadly heat wave, the team at Grey Sloan struggles to keep up with an overwhelming amount of patients. Amelia and Winston face a challenging surgery, while Jo and Lucas run an errand for the hospital that takes an unexpected turn.

The doctors at Grey Sloan must put aside their emotions under intense circumstances. Levi asks James a shocking question that could impact their future.

Teddy and Owen plan a date night that gets derailed in more ways than one, while Jo struggles to do it all at home. Mika adds more to her plate to make up for taking time off to be with her sister, and Levi is faced with a monumental decision.

During a high-stress day at Grey Sloan Memorial, the fates of a patient in critical condition and a helicopter-bound medical team hang in the balance. Beltran spearheads an initiative, Teddy and Owen work on their marriage, while Bailey, Blue and Link treat a hospital employee.

Mika struggles with a life-altering personal matter. Meanwhile, Bailey and Ben navigate their personal and professional roles, while Levi finds a connection in an unlikely place. Jo and Link get surprising news.

Simone and Lucas work to balance their relationship while competing to assist on an awake kidney transplant. Teddy offers Amelia a new opportunity, and Ben�s interview doesn�t go as planned. Meredith�s secret causes tension with Richard.

Meredith and Catherine continue to disagree, and Meredith confides in Bailey for support. Richard, Winston and Lucas spend the day outside of the hospital, and Blue deals with a relationship from his past. Levi meets the new hospital chaplain.

After firing some of Grey Sloan�s best, Catherine continues to interfere with Meredith and Amelia�s research. Accidents at a climate change protest bring unique cases to the hospital, and Bailey encounters a blast from the past.

Wildfires threaten the Seattle region, leading to a flood of patients and emergency procedures. The doctors juggle overcapacity in the ER, complex surgeries and personal stress. Meanwhile, Meredith makes a rash decision that can�t be undone.

Just as Amelia comes to a realization, Teddy encourages her and Meredith to speed up their Alzheimer�s research over fear of Catherine finding out. Mika finds herself caught in the middle of Link and Jo; meanwhile, Lucas receives bad news.

Owen and Teddy have the day off but encounter an injured civilian. Monica enlists Amelia�s help with an operation on a young patient. The interns complete their procedure logs, allowing them back into the OR.

An unexpectedly complex case brings back painful memories for Simone. Jules and Blue make a high-stakes bet on who can finish their procedure log first. Richard suspects Winston is avoiding him.

Mika and Teddy receive a patient from a nearby penitentiary. Catherine pushes back on Link and Monica�s treatment plan for a VIP. Bailey tries to integrate wellness into the residency program.

It�s all hands on deck at Grey Sloan when a group of medical students is injured by a floor collapsing at their white coat party. Jo and Link are forced to talk about the future, while Jules confronts Winston about his attitude.

Dr. Arizona Robbins returns to Grey Sloan for a particularly complicated case. The interns are interrogated about their past mistakes, while Teddy is eager to return to work after her health scare.

Meredith and Amelia work to secure funds for their research while Amelia finds herself at odds with a new attending. Levi runs into someone from his past, and Owen gives Winston advice. Lucas ditches Mika, forcing her to treat a patient alone.

Bailey tells the interns they must complete dozens of basic procedures before being allowed back in surgery. Things are awkward between Simone and Lucas. Amelia comes up with a solution to a complicated surgery.

Meredith rethinks her plans after going rogue in last season�s finale. The interns are on thin ice following a patient�s death, but Simone and Lucas are immediately tested in an emergency. Richard confides in Bailey, and Teddy�s fate is revealed.

The attending surgeons fly to Boston, forcing a reunion between Nick and Meredith. Bailey gets a big surprise.

Simone�s wedding day arrives as Jo and Link�s relationship hits a major turning point.

Richard and Teddy make an exciting announcement. Jules and Blue butt heads over Maxine�s care while Lucas helps an artist decide on a risky procedure. Jo and Mika tend to Sam as Simone faces a life-changing decision.

Teddy calls an emergency meeting to discuss the intern program. Link wrestles with his own self-doubt as he preps for a massive surgery, and Nick shares some much-needed guidance with a struggling Lucas.

Amelia takes her personal problems out on her work colleagues, and the threats against Bailey come to a terrifying head. Lucas and Jules make a risky decision on a patient, and Mika struggles with burnout.

With Levi�s help, a patient celebrates a milestone. Jo processes a difficult diagnosis, and Maggie and Winston decide their future.

It�s Maggie�s last day. Amelia�s relationship with Kai is tested, and Ben worries as Bailey�s doxing intensifies.

A bull rider shows up at Grey Sloan with severe injuries, forcing Maggie, Amelia, Owen and Blue to examine their own biases. Elsewhere, Simone can�t find anyone to be her maid of honor, and Mika takes drastic measures to pay down her student debt.

In the immediate aftermath of shocking events at the clinic, the hospital goes on lockdown and the Grey Sloan doctors split up to save multiple lives. Meanwhile, Maggie lands in hot water with Winston, and Jules� roommate makes a surprise appearance.

Addison makes a special appearance at Grey Sloan to welcome Bailey�s new OB/GYN trainees. Maggie�s lung transplant is derailed, and Nick bonds with Lucas � before the day takes a shocking turn.

Catherine returns to Grey Sloan for a surgical case that makes Lucas and Blue queasy. Amelia treats a possible cancer patient with a family that�s a little too supportive. Owen takes his medical future into his own hands, much to Teddy�s surprise.

Simone is met with a life-changing decision upon the return of someone from her past. Blue shadows Maggie on a risky procedure, while Jo and Link tend to a pregnant woman. At the intern house, Lucas and Mika throw a party filled with surprises.

Teddy makes a challenging decision. Meanwhile, Maggie and Winston aren�t on speaking terms, and Link leans on Jo for emotional support as he preps for a surgery on a well-known athlete. Simone and Lucas are surprised by an unlikely visitor.

It�s Meredith�s last day at Grey Sloan Memorial and the doctors plan a goodbye surprise, while Nick confronts her about the future of their relationship. Elsewhere, the interns compete to scrub in on Maggie and Winston�s groundbreaking partial heart transplant procedure, and Richard asks Teddy an important question.

On the heels of life-changing news, a thunderstorm hits Grey Sloan. The attending surgeons and interns work together to save an injured reporter and family affected by the storm. Meanwhile, a beloved author undergoes a risky surgery, and complications from the storm arise.

Bailey and Addison take a road trip to volunteer at a family planning center, but a patient�s ectopic pregnancy leads to complications. Elsewhere, the interns play detective about Lucas� relationship with Amelia, and Meredith catches up with Jackson on a trip to Boston.

It�s Halloween night at Grey Sloan Memorial. Meredith and Nick try to spend some alone time together; Levi is stressed due to overworking, and Winston and Owen have the interns practice trauma training on a real cadaver.

Bailey recruits the interns to create a series of social media videos informing teens about sexual health. The videos, filmed at Grey Sloan in front of a group of high schoolers, hit home as a student has medical complications during her visit. Elsewhere, Meredith and Maggie learn something new about Zola.

The attending surgeons and interns work together to solve a medical mystery when a college kid comes in with what first looks like food poisoning but has escalating and dire complications. Meanwhile, Jo spends her day off with Bailey.

After a long six months, Grey Sloan Memorial has reinstated its residency program. A group of talented and striving young interns has been recruited as the attending surgeons work to rebuild the program to its former glory. Meredith, still functioning as the interim chief, sees Nick for the first time since she rejected his offer to move to Minnesota. Meanwhile, Bailey tells Richard she is not ready to return to work; Levi works up the courage to break disappointing news to Jo, and things turn awkward when Link realizes he has met one of the interns already. With Amelia and Maggie�s help, the new doctors are thrown into their first day on the job dealing with injuries from a recent tornado.

The blood shortage at Grey Sloan Memorial continues. Meanwhile, Meredith makes a risky decision regarding a patient, and Owen�s actions to help his fellow veterans come to light.

Due to a blood shortage, Grey Sloan Memorial is setting up a voluntary donation center. Meanwhile, Nick asks Meredith for help with his patient and Winston is hung up on his relationship with his brother.

A dinner party is thrown at the sister house in Nick�s honor. Meanwhile, Grey Sloan Memorial receives a victim of a brutal hate crime.

A former patient of Link�s, Simon, is in the ER with his pregnant wife; and Bailey receives an offer from Nick.

Bailey faces an unhappy Catherine who is facing audits for several of her Foundation hospitals. Meanwhile, Addison is back at Grey Sloan; tensions rise between Meredith and Richard, and Owen returns to work.

Bailey is on edge when an accreditation council stops by Grey Sloan to review the residency program, while Richard sets an assessment of his own for the same day. Meanwhile, Nick returns to Seattle to perform a first-of-its-kind operation with Meredith.

Tensions at Grey Sloan Memorial rise as the effects of the physician shortage begin to show. Meanwhile, Meredith struggles to step away from work as she spends a sick day at home with Zola, and the hospital receives an unexpected visitor.

While Richard ponders his surgical abilities, Jo is charmed by her patient�s brother. Elsewhere, Megan makes sure Teddy and Owen talk out their differences, and a pet python causes an uproar.

Nick whisks Meredith away to his Minnesota cabin for a romantic weekend, leaving Winston and Maggie to care for Meredith�s children. Meanwhile, Amelia and Kai grow closer.

While Meredith, Amelia and the team prepare for Dr. Hamilton�s long-awaited, groundbreaking surgery, Bailey receives an unexpected offer. Owen�s impatience makes him a difficult physical therapy patient, forcing Link to intervene. In Minnesota, Nick makes a liver transplant a teaching moment.

Schmitt must face the Morbidity and Mortality conference. Meanwhile, Meredith convinces Nick to scrub in on a surgery in Seattle, and Jo faces her feelings.

The Grey Sloan Memorial doctors grapple with the aftermath of the car crash that involved some of their own; Meredith works to save Dr. Hamilton's life. Levi is impacted from his latest loss. Part 2 of a crossover with �Station 19� which starts on S05E09 �Started from the Bottom�

The doctors of Grey Sloan Memorial celebrate the holidays; Hamilton and Meredith prepare for a milestone on their project; Link wants to spend the holiday with Amelia and Scout as a family; Schmitt is faced with a difficult decision during surgery.

Dr. Hamilton takes his frustrations out on Meredith, so Nick gives her a chance to blow off steam by scrubbing in on a surgery. Back in Seattle, Link and Jo take their kids to a fairytale theater performance that goes wrong. Bailey and Dr. Lin attend a recruitment fair in hopes of attracting more doctors to Grey Sloan but find themselves ill-prepared.

It�s Thanksgiving and while Meredith faces travel complications due to the weather, Nick steps in to help in more ways than one. Meanwhile, Richard and Bailey seek out emergency surgeries, and Amelia and Link reconnect.

Part 2 of a crossover with �Station 19� which starts on S05E05 �Things We Lost in the Fire.� The Grey Sloan doctors spring into action after an explosion rocks Seattle, with the incoming trauma hitting close to home. Owen experiences PTSD after he hears the explosion, while his sister Megan enlists help from Winston and Hayes in confidence. In Minnesota, Meredith and Amelia meet up with a familiar face who assists in their study.

Richard recruits Meredith and Bailey to help him launch a new program. Addison's patient has complications from a procedure. Jo helps a woman who goes into premature labor.

Seattle�s favorite redhead returns and graces the Grey Sloan halls with her experience and expertise as she attempts to help Richard teach the newest crop of residents. Meanwhile, Meredith has a decision to make, and Link confides in Teddy.

Meredith seeks advice from Amelia. Meanwhile, Richard is reenergized as he takes teaching to a new level at the hospital, and Winston treats a patient suffering from kidney failure.

As the city of Seattle revels at the Phoenix Fair celebrating the city�s rebirth post-COVID, the Grey Sloan doctors treat a patient who encounters illegal fireworks. Meanwhile, Bailey has her sights set on hiring new doctors, but she�s having trouble finding viable options. Owen and Teddy attempt to take the next step in their engagement, and Meredith has a surprising opportunity when she meets a dynamic doctor from her mother�s past. The crossover starts on Station 19 S05E01 Phoenix from the Flame.

It's wedding day for Maggie and Winston. Meanwhile, Meredith takes on a new role at the hospital, and Jo makes a life-changing decision.

Levi gets accepted into the vaccine trial. Amelia and Owen treat a car crash patient. Hayes and Jo are met with Luna's legal guardian.

Jackson shares his big news with his colleagues while Koracick and Levi fight to save a pregnant woman's grandfather as she goes into labor. Maggie keeps a watchful eye on Meredith as Bailey and Richard put off telling her about DeLuca.

Jackson pays a visit to his father that helps set him on the right path.

Amidst the need for more surgeons, Jo tries to convince Bailey to let her switch specialties. Elsewhere, Link accuses Amelia of overstepping while he is treating a patient remotely, and Winston comes up with an out-of-the-box idea.

Maggie is preoccupied with Winston while trying to treat a patient wounded in the Seattle protests. Meanwhile, Levi is tested by an emergency, and the doctors struggle to treat a patient who doesn't believe in COVID.

The Grey Sloan doctors are stuck in the middle of a fight between a newlywed couple who are injured in a car accident and brought to the hospital for treatment. Meanwhile, Jackson's generosity with COVID-positive patients goes a bit too far, and Hayes works to rebuild Maggie's confidence and convince her to perform an extremely risky heart surgery. The crossover started on Station 19 S04E10 Save Yourself.

The hospital ventilator shortage has the doctors gravely concerned; Hayes' high-risk sister-in-law with multiple sclerosis ends up in the hospital with a kidney stone.

After a heart-wrenching loss, Teddy struggles to cope and it triggers memories of her past; Amelia tries to help the situation by encouraging Owen to accept and forgive Teddy.

As traumas and pressure mount, Grey Sloan doctors try to find a path forward; Maggie gives Winston hospital privileges and they work together to treat an uneasy patient; Jo, Link and Jackson play an unconventional drinking game.

Part 2 of a crossover with Station 19. The doctors are joined by the team from Station 19 as they tend to a tense situation with a lot at stake. Jo convinces Hayes to bend the rules on a case. Maggie and Winston reconnect. The crossover starts on Station 19 S04E06: Train in Vain (1).

Grey Sloan Memorial faces new pressures as Seattle Pres is overloaded, and Grey Sloan Memorial is now on surge capacity protocol. Meanwhile, Owen and Amelia are faced with one of the most controversial surgeries of their careers.

Bailey panics as she hears there has been a surge of COVID-19 cases, knowing she has loved ones in an assisted living facility. Meanwhile, Jackson and Richard team up against Catherine to teach her a lesson, and Teddy continues to try to mend her frayed relationships. After an intense surgery, Jo is uncertain about her future.

Owen faces a medical diagnosis that challenges more than he imagined. Koracick begins to go stir crazy. Maggie gets a not-so-subtle glimpse into Winston's background.

The Grey Sloan doctors continue to face their new COVID-19 reality and deal with a familiar and stubborn patient. Koracick is put in charge of the interns who recently joined the hospital ranks and Link operates on a sex therapist. Elsewhere, Maggie finds comfort in Winston's virtual presence.

Bailey finds herself in the middle of an argument with patients' families as they await news about their children who were injured in a fire. Winston surprises Maggie, and Amelia and Link try to have some fun as new parents. Teddy learns her colleagues know more than she may like about her relationship woes with Owen, and Richard and Koracick go at it.

In the midst of the early days of the COVID-19 pandemic, Grey Sloan Memorial and its surgeons' lives have been turned upside down. It's all-hands-on-deck as Meredith, Bailey and the rest of the Grey Sloan doctors find themselves on the frontlines of a new era. Meanwhile, an unintentionally started fire has first responders from Station 19 bringing patients into the hospital for treatment.

Link tries to convince Amelia to take it easy during the final stage of her pregnancy. Hayes asks Meredith a surprising question, and Owen makes a shocking discovery.

Owen and Link treat an older woman who wakes up from surgery and can�t stop singing, while Teddy helps Koracick stay afloat after an estranged loved one from his past comes to the hospital looking for help. Meredith, Bailey and Maggie focus their efforts on a difficult patient with a tricky diagnosis.

Richard preps to present his PATH pen at the LA Surgical Innovation Conference but becomes distracted by his issues with Catherine. Maggie and Teddy run into people from their past at the same conference, while Hayes relives moments from when he met his late wife.

Meredith heads up a pro bono surgery day, but the overwhelming patient response causes her to struggle to keep things in order. DeLuca treats a teenage patient whom he suspects is in danger and desperately tries to get Bailey to support his theory.

A wealthy inventor arrives at Grey Sloan and asks Koracick for help, while Meredith struggles to save a woman with diabetes who has been rationing her insulin. Jo and Link fight to save a young man who fell onto train tracks, and Jackson and Vic�s relationship hits a snag.

Bailey and Ben face a huge, life-altering decision, while Meredith, Jo and Bailey reflect on their past.

Meredith and Carina question DeLuca�s uncharacteristic behavior when he volunteers to perform a life-threatening task during a blizzard. Meanwhile, Bailey tries to help Joey with his future, while Richard trains a new intern at the hospital.

DeLuca is irritated after Meredith takes over his patient Suzanne whose symptoms continue to stump the doctors at Grey Sloan. Elsewhere in the hospital, Jackson, Owen and Jo work on a couple injured in a bear attack. Levi is hurt when Nico doesn't want him to meet his parents.

DeLuca can�t figure out what�s going on with his incurable patient Suzanne and he turns to a diagnostics genius, Dr. Riley from UCSF, for help. Bailey checks in on Joey, a foster kid that Ben brought into Grey Sloan. Meanwhile, Amelia is getting the results of her paternity test and Jo confronts her about how she is treating Link.

Jackson creates an uncomfortable situation when he invites new girlfriend, Vic, to what he thinks is Richard and Catherine�s anniversary celebration, only to discover the dinner was called for different reasons. Elsewhere, Levi brings Nico on a trip to visit an ailing family member.

Richard finds out Maggie quit Grey Sloan and is concerned about how she�s handling the death of her patient who was her estranged cousin. Bailey returns to work after taking some personal time off, although Koracick doesn�t make her first day as easy as she�d like. Meanwhile, Meredith thinks she might miss DeLuca, and Amelia has an update for Link on her pregnancy.

Part 2 of a crossover with Station 19. Following the car crash at Joe's Bar and subsequent rescue efforts led by the Station 19 firefighters, Grey Sloan doctors work through the night to save the lives of their colleagues. Amelia worries about sharing her pregnancy revelation with Link. The crossover starts on Station 19 S03E01: I Know This Bar (1).

Jo becomes a safe haven volunteer and gets a call that a baby has been dropped off at Station 19. Meanwhile, Meredith moves forward with her life after facing the medical board. Jackson takes a big step in his budding romance with Vic, while Bailey and Amelia swap pregnancy updates.

Meredith faces the medical board as her future as a doctor remains uncertain, and she�s forced to reckon with her past in some challenging ways. Meanwhile, the interns are put to the test as they are each vying to be the most successful on their respective cases in the absence of some of the attendings.

Catherine is back in town and has no idea what�s been going on between Jackson and Maggie, while her relationship with Richard has become distant. Owen and Amelia treat a woman who fell in the basement and quickly realize that there is more to the story; and Maggie is shocked to learn about some of Richard�s relatives who are seeking help.

Alex is hoping to impress investors at Pac-Gen North, but when he hears disturbing news about skeletons on the construction site grounds, he enlists Richard to help with distraction tactics. Teddy feels the pressure to be super-mom after tasking herself with creating original Halloween costumes for Allison and Leo, while Meredith fears she won�t make it home in time for trick-or-treating with her kids. Elsewhere, Jackson tends to a pediatric patient who is upset she is spending her Halloween in a hospital.

Meredith has a court hearing after skipping out on community service, while Bailey and Jo have a patient that Jo realizes is from the treatment facility. Richard and Gemma grab breakfast together and things go awry.

After Meredith inadvertently stirs up negative press for Grey Sloan, she tries to make things right with her former colleagues, jeopardizing her community service hours. Station 19�s Ben and Vic bring a young woman into the hospital, and Jackson stands up to Koracick when he goes too far with a patient�s family. Meanwhile, Bailey receives unexpected news; and Owen finds himself at Pac-Gen North, which Alex sees as a recruiting opportunity.

A patient at the hospital is brain dead after falling into a construction site, and her two sisters must decide whether or not to keep her alive.

The Grey Sloan doctors operate on a man who crashed into Maggie�s car as Owen, back from paternity leave, struggles with Tom�s new position. Outside the hospital, Meredith�s recent firing doesn�t stop her from diagnosing those around her. Plus, Richard and Alex start anew and it�s not easy. All the while, Jo readies herself to return to work, and Amelia has a new revelation in her relationship with Link.

Meredith, Richard and Alex must deal with the consequences after Bailey fires them from Grey Sloan for insurance fraud. After disappearing in the fog, Jackson helps a man in a dangerous situation, as his relationship with Maggie comes to a new crossroad. Meanwhile, Tom gets new responsibilities at the hospital that throw the doctors for a loop.

As fog begins to cover Seattle, the doctors of Grey Sloan navigate through personal complications. Meredith and Alex attempt to save Gus, while Levi talks some sense into a struggling Nico.

Alex tries desperately to save his patient Gus while he waits for a severely agoraphobic blood donor to arrive from London. Jo reveals to Meredith why she�s been so down, while Catherine and Bailey hold a meeting to get down to the bottom of an insurance issue. Meanwhile, Maggie and Jackson go camping.

Part 1 of a crossover with Station 19. Maggie treats one of Station 19�s own, and Jo learns a hard lesson. Meanwhile, when working with a family seeking asylum, Meredith makes a call that could jeopardize her career. The crossover continues on Station 19 S02E15: Always Ready (2).

Meredith debates how to handle an unexpected situation in her personal life, while Richard has an untimely reunion with an old friend. Jo has a hard time at work, and Owen tries therapy.

Amelia and Link travel to New York to operate on a patient with a severe spinal deformity, but they�re in for more than they bargained for when Nancy Shepherd invites them to dinner at her home.

Owen and Teddy have to deal with the surprise arrival of Megan Hunt, who knows nothing about their situation. Catherine preps for her first surgery back on a war veteran who�s not emotionally prepared for his procedure. Meredith worries about DeLuca operating alone with Richard.

When a trauma patient arrives at Grey Sloan, it forces Jo to confront her past. Meanwhile, Bailey and Ben have to talk to Tuck about dating.

Maggie introduces mood rooms as an alternative approach to medicine. Alex and DeLuca butt heads over an 11-year-old patient who tries to sabotage her own surgery. Jackson and Richard deal with a gender non-binary patient. Meanwhile, Teddy has a pregnancy scare that brings Owen and Koracick to odds.

Ties are strained as Andrew and Carina confront an unforgiving family history. Meanwhile, Teddy and Owen work together on a married couple who is expecting, and Amelia attends a conference for alternative pain relief.

Meredith finds herself having to side with either Alex or DeLuca during a difficult situation, but she doesn�t want to betray either of them. Meanwhile, Maggie reveals details about her personal life that cause a public stir, and Levi struggles with whether or not to tell his family about Nico.

When Jackson throws a party to celebrate Catherine�s surgery and those who worked to save her, literally nothing goes as planned. Meanwhile, Helen pays Alex and Jo a surprise visit.

While Meredith breaks a hospital record, the rest of the doctors are sent scrambling in the wake of a massive overdose within the community. Meanwhile, Jackson wants to take a reluctant Maggie camping, and Levi and Nico�s relationship continues to develop.

A sea of patients flood Grey Sloan Memorial after gunfire goes off at a parade. A blast from the past throws Maggie off her game on the same day that Meredith tries to talk to her about her dating situation. Meanwhile, Owen and Amelia get some potentially life-altering news about Betty.

A patient gives Meredith some clarity on her dating situation around the holidays. The strain on Bailey and Ben�s marriage comes to a head. Meanwhile, Betty drops a bomb on Owen and Amelia.

Amelia and Koracick tackle a daunting surgery on Catherine while Richard and Jackson hope for the best. Meanwhile, Richard urges Meredith to visit her father, Thatcher, before his time is up.

Meredith questions Link�s laid-back approach over a patient�s treatment. Maggie worries that Richard, Jackson and Catherine haven�t come to terms with Catherine�s diagnosis. Meanwhile, Deluca steps up in the O.R. when Owen faces a setback.

When the power goes out at Grey Sloan, the doctors are left scrambling to save their patients' lives; Owen, Amelia and Teddy confront their complicated situation.

Seattle is hit by a huge windstorm and Grey Sloan becomes inundated with patients; Alex and Jo are stuck at home and decide to make the best of it by having a second honeymoon; Meredith confronts Richard about getting his life back on track

Catherine is in Los Angeles getting the new foundation ready and summons Meredith and Koracick to visit for a highly confidential consult. Meanwhile, one of the nurses is 28 weeks pregnant and collapses at the hospital while talking to Richard.

Meredith has a patient whose family is celebrating Day of the Dead, making the doctors remember loved ones they have lost. Richard shares unexpected news with Meredith about her father, Thatcher. Meanwhile, Teddy tries to tell Owen that she is pregnant but they get sidetracked, and Jo encourages Link to pursue one of the doctors.

Meredith reaches out to Teddy and helps her talk through some of her personal struggles; Owen and Amelia hide out near Betty's school after she becomes a flight risk; Jo wants to get to work on the fellowship, but Bailey's attention is elsewhere.

Part 1 of a crossover with Station 19. Meredith turns heads when she shows up to work done up and ready for her blind date later that day, while Alex makes a questionable decision in order to save a patient. Meanwhile, the burden of knowing Teddy�s secret keeps Maggie up at night, ultimately making her decide she has to tell someone. The crossover continues on Station 19 S02E02: Under the Surface (2).

Meredith works on a patient who happens to specialize in matchmaking, and a seemingly drunk patient pushes Richard's buttons and gives him a medical mystery to solve. Meanwhile, Maggie tries to reach Teddy after bearing the burden of her secret becomes overwhelming as she struggles with issues in her own personal life.

New doctors continue to shake up the hospital in typical Grey Sloan manner. Meredith bonds with a patient while Jackson struggles with the meaning behind recent experiences; and after making a life-changing decision, Jo forms an unexpected alliance.

The doctors at Grey Sloan Memorial vie for a new position. Meredith is seemingly distracted and struggles to stay focused, and Maggie finds herself the keeper of a big secret while Amelia and Owen try to figure out their relationship. Meanwhile, Jo and Alex's honeymoon doesn't go exactly as planned.

The doctors attend Alex and Jo�s wedding, and things do not go as planned. Meanwhile, the stress from the past year has taken a toll on Bailey, and she will re-evaluate some of her decisions.

One of Grey Sloan Memorial�s own is seriously injured, making the team reflect on what is truly important to them. Meanwhile, Nicole Herman pays a visit to GSM and talks to Arizona about an exciting opportunity.

Alex and Jo go on a road trip to Iowa to find Alex�s mom, whom he hasn�t heard from in a very long time. Meanwhile, Meredith gives a presentation on her mini-livers project, which attracts a ton of attention, and Jackson works to rebuild the foundation after its reputation is threatened.

The hospital brings in crisis management to help sort out allegations against Harper Avery; nurse Olivia shows up at Grey Sloan with her son, throwing Alex and Jo for a loop; Sofia is having a hard time at school.

During presentations on Grey Sloan Surgical Innovation Prototypes Day, Arizona shares some cookies from an appreciative patient that, unbeknownst to her, contain a special ingredient. Meanwhile, Catherine reveals some shocking details to Jackson about his grandfather�s past; and Jo steps in mid-operation on a major surgery after Bailey and Meredith are down for the count.

An agent from ICE shows up at Grey Sloan in search of an employee who may be working in the U.S. under DACA. Alex�s patient Kimmie wants to leave the hospital to enjoy her final days, but Alex feels differently. Meanwhile, Arizona treats Matthew Taylor�s baby and April wants to do whatever she can to help.

Amelia, Koracick and DeLuca perform a risky procedure to remove a young patient's brain tumor; Meredith and Jo work with different polymers to try to salvage their project submission; Richard's AA sponsor is admitted to Grey Sloan with a DNR.

April�s crisis of faith is challenged by a patient she treats who is a rabbi, and Meredith treats a patient who is a transplant surgeon from another hospital.

Maggie and Jackson are enjoying spending time together, but he must turn his concentration toward the groundbreaking vaginoplasty surgery he has scheduled with Catherine and Richard. Meanwhile, Meredith and Jo hit a roadblock with their contest submission, so Jo helps Bailey with an incoming trauma patient who used to be an astronaut.

Meredith tries to learn more about Marie Cerone�s history with her mother. Meanwhile, Jo is applying for fellowships around the country and it throws Alex for a loop; and Tom Koracick helps April acknowledge her crisis of faith.

Maggie�s relationship with Clive starts to progress, and she invites him over for a game night to meet Meredith and Amelia. Meredith and Jo meet with the owner of the patent to the polymer they need for their project, who coincidentally is a friend of the family.

Seattle firefighters Ben Warren and Andy Herrera head to Grey Sloan after rescuing two boys that are injured in a house fire. With one of the boys� lives literally in Andy�s hands, her skills are put to the test. Meanwhile, the doctors are hard at work on their projects for the Grey Sloan Surgical Innovation Contest; and Amelia brings Tom Koracick in to consult on her and Alex�s patient. This episode serves as a backdoor pilot for Station 19.

April is in charge of the new Grey Sloan Surgical Innovation Contest, and the doctors are eager to start their projects. Meanwhile, Catherine�s old friend has a shocking idea for Catherine and Jackson; and Meredith treats a returning patient who inspires her project.

The stress of managing the hospital and coming to terms with Ben's decision to become a Seattle firefighter pushes Bailey to her limits.

A young boy is admitted to Grey Sloan Memorial and his case has a profound impact on the doctors. Meanwhile, April is faced with a surprising patient, and Jo continues to deal with her estranged husband.

Jo finally faces her estranged, abusive husband Paul Stadler, while Grey Sloan continues to work with the FBI after a hacker has compromised the hospital�s computer system.

A hacker compromises the hospital�s computer system, causing monitors, phones, labs and patient files to all go down. As technology fails them, Bailey attempts to keep the peace but chaos erupts and the doctors are forced to get creative in their methods to treat the patients.

After a roller coaster car falls off the track at the county fair, the doctors at Grey Sloan tend to patients who spark memories about ghosts from their past. The series 300th episode!

Jackson decides he needs some time off and invites the guys to join him on a day out at sea, while Arizona, April and Maggie treat a woman who is hiding a deadly secret.

In a flashback to Iraq in 2007, the events leading up to Megan�s kidnapping are revealed. In present day, Owen and Megan hash out old wounds.

Amelia confronts a difficult situation, while Meredith deals with the fallout from her conversation with Nathan. Maggie finds herself at an awkward family dinner, Jackson receives big news and Richard and Bailey search for the stars of tomorrow.

Harper Avery arrives at Grey Sloan, putting Bailey on edge. A familiar face from Meredith's past returns as a patient, and Amelia tries to manage a secret.

Meredith struggles to come up with a new plan for Owen�s sister. Jo makes a surprising choice regarding Alex, and Andrew�s sister�s controversial research leads to a shocking discovery.

Season 14 opens as Meredith and the team are focused on helping Owen�s sister after her shocking return, and Amelia faces a conflict over a patient. Meanwhile, Bailey is forced to give Grey Sloan a facelift after the fire, and the doctors are introduced to a few new faces that spice things up around the hospital.

In the season finale, the doctors' lives are at risk after a dangerous patient escapes the hospital room. Alex must make a hard choice in his relationship with Jo while Meredith has some big news for Nathan that brings things to a turning point.

The doctors of Grey Sloan encounter a difficult case involving a dangerous patient. Meanwhile, Owen receives life-changing news that pushes Amelia to step up to support him, and Alex attends a medical conference after making a shocking discovery.

April and Andrew consult with a fiery patient who has a giant, inoperable heart tumor. Meanwhile, Alex and Eliza are at odds over the treatment of a young patient, and Stephanie and Ben make decisions that could affect their careers.

Bailey and April work to fix things between Richard and Catherine; Eliza continues to pursue Arizona; one of Alex's previous patients returns to Grey Sloan.

Meredith and Nathan have to confront their feelings when they are are stuck sitting next to each other on a plane.

When Maggie takes on a big case, many of the doctors are worried she�s not the right one for the job while Stephanie makes a mistake treating one of Grey Sloan�s own.

When Maggie�s mom�s health deteriorates, the doctors are at odds over how to treat her. Meanwhile, Richard comes to grips with Bailey�s betrayal over the Residency Program.

Diane Pierce returns to Grey Sloan, but Maggie is still in the dark as to why she�s really there. Owen and Amelia hash out their problems as they work a trauma case together, and Bailey tries to mend her relationship with Richard.

Jackson and April travel to Montana in order to perform a complicated surgery on a young patient, but Jackson�s mind is elsewhere, and April is forced to step up and get him back on track.

Richard, Jackson, April and Catherine tackle a tough trauma case intensified by hospital politics; Amelia finally faces her feelings about Owen; Meredith gets caught between Nathan and Alex over a patient.

Alex returns to the hospital and discovers a lot has changed since he left. Meanwhile, Jo has to make a difficult decision on a case, and Arizona tries to distance herself from Eliza.

The residents are excited for Eliza�s next phase of teaching, but they spend the day caught between the warring attendings. Meanwhile, April has a challenging first day in her new role at the hospital.

Maggie gets a surprise visit from her mother at the hospital. Bailey has to make a difficult decision when one of the attendings refuses to work with Eliza, and Stephanie gets caught up in Owen and Amelia�s personal drama.

Richard and the attendings set out to make Eliza�s first day at Grey Sloan a bumpy one. Meanwhile, Meredith tries to track down Alex.

Bailey, Arizona and Jo go to a maximum security women�s prison to treat a violent, 16-year-old pregnant girl and her unborn baby.

Believing he is going to jail tomorrow, Alex makes a big decision about his future. While the hospital is overrun with victims of a building collapse, Richard demands answers from Bailey about Eliza�s presence at Grey Sloan.

A difficult surgery brings back pivotal memories for Meredith, Richard, Owen and Stephanie, as they work together to save a life.

The arrival of a new consultant puts all of the doctors on edge, especially once she starts stepping on toes in the OR. Amelia and Owen bring their personal problems into the hospital, while April explores some uncharted territory.

A familiar face returns to Grey Sloan, throwing many of the doctors for a loop. With Catherine putting on the pressure, Bailey has to make a decision about Alex while a tough ER case makes Amelia�s bad day even worse.

Meredith and Bailey are at odds when both of their patients need a liver transplant, Owen seeks help from the other doctors when he is charged with babysitting baby Harriet for the day, and Amelia struggles with telling Owen some important news.

Alex tries to do the right thing but still cant catch a break. Jackson and April adjust to their �new normal� with the baby. While Meredith and Nathan establish what�s going on between them, Amelia questions the state of her relationship with Owen.

A car crash at a funeral brings a bickering family into the hospital. Back from New York, Arizona ends up caught between Alex and Andrew. While Ben takes on a new parenting role, Amelia helps Meredith and Maggie through a problem.

Meredith considers her loyalties, as Alex deals with the repercussions of his actions. Newlyweds Amelia and Owen host a dinner party with unlikely guests, and Jackson proposes an arrangement to help April through her recovery.

When one of Grey Sloan�s own lands in the hospital, Bailey tries to figure out what happened while the rest of the doctors jump in to help. Meredith juggles huge secrets that affect her relationships with Alex and Maggie. While Richard helps Jo with a big decision, April and Catherine clash over the new baby.

Meredith and Maggie support Amelia on an important day; Jo reveals that she has been keeping secrets from Alex while Arizona and Callie deal with the impact of their custody arrangement. Meanwhile, Ben leaps into action to help a friend.

Owen and Amelia take their relationship to the next level; Alex gains some clarity on his future with Jo; and Callie and Arizona continue to struggle with the current custody arrangement.

Callie and Arizona are at odds over Sofia�s future, and Stephanie questions the status of her relationship with Kyle. Meanwhile, Alex and April work on a pregnant teen that is readmitted to Grey Sloan Memorial.

Stephanie�s relationship with Kyle becomes complicated. Meanwhile, Meredith encourages Amelia and Owen to take a chance and choose to be a real couple. Arizona and Callie are at odds and put their friends in the middle of an uncomfortable situation.

The doctors work frantically to save a young boy who was accidentally shot. Meanwhile, Arizona is upset when Callie tries to make an important decision about Sofia�s future without consulting her

Miranda continues to deal with the aftermath of Ben's reckless decision and forms an advisory committee to recommend proper disciplinary action against him. Meanwhile, April and Jackson try to put their differences aside for the sake of their baby, and Arizona makes a decision that could affect her relationship with Callie forever.

After a missing child forces the hospital into lockdown, Ben decides to operate on a pregnant mother without the proper surgical equipment. Miranda, as Chief, is faced with the repercussions of the event and whether or not Ben's impulsive actions were justified.

Meredith goes on an ambulance ride with Owen and Nathan to pick up a heart for a transplant patient. Musician & MS patient Kyle Diaz is admitted to Grey Sloan Memorial with a tremor in his hand, and the residents apply for the Preminger Grant. Meanwhile, Catherine continues to insert herself into Jackson and April's business against Richard's wishes.

Meredith regrets taking a step forward with Will; Maggie feels disconnected from Andrew; Amelia takes another look at her relationship with Owen; Catherine shakes things up for April and Jackson.

Jackson learns about April�s pregnancy, while Alex and the team of doctors handles an hours-long triple-organ transplant surgery. Meredith considers dating again, and Andrew insists on not receiving special treatment after he and Maggie go public.

Richard throws everyone for a loop when he switches the resident and attending pairings, and Arizona takes a huge risk on a woman who is pregnant with quadruplets. Meanwhile, April is faced with a difficult decision.

Meredith, Bailey, Jackson, Callie and Jo travel to a military hospital to perform an extraordinary and extremely risky surgery on a veteran with an advanced tumor. Meanwhile back at Grey Sloan, Andrew is tired of being Maggie�s worst kept secret; Ben makes an impulsive surgical decision; and a team of cheerleaders wreak havoc in the ER.

A patient from Meredith's very first surgery as an Intern is readmitted to Grey Sloan Memorial with a new aneurysm, and Amelia takes her case. Meanwhile, Maggie suspects that Richard knows about her relationship with Andrew, and Arizona debates dating again.

The evolution of April and Jackson's relationship is revealed through a series of flashbacks dating back to when they first met. Simultaneously, we follow the years-long progress of one of Jackson's patients.

As the hospital deals with Meredith's trauma, Callie and Maggie perform a risky, experimental surgery on Alex's 15-year-old patient against his professional opinion. Meanwhile, Owen and Nathan are still at odds with each other, and Maggie and Andrew's relationship continues to develop.

Meredith is brutally attacked by a patient, and Penny is the one who discovers her. The doctors of Grey Sloan Memorial rush to stabilize Meredith and remain by her side in the harrowing aftermath.

As the rumor mill around the hospital continues to spiral out of control, Grey Sloan Memorial is flooded with injured firefighters from a nearby wildfire. Maggie struggles to keep things with Andrew professional at work; meanwhile, Jo questions Alex�s priorities.

The team of doctors work on a high stakes case of a long time patient, adding additional pressure to an already tense environment. Meanwhile Bailey wants Ben to kick out their new roommate, and Arizona is eager to get back into the dating world with a new wingman.

Grey Sloan Memorial not only welcomes a new transfer resident, but also a patient who's the topic of converstation after accidentally sending his sex tape to his entire congregation. Meanwhile, Richard wrestles with how to progress his relationship with Maggie when an old friend visits the hospital, and April brings in a case of a young boy from the Middle-East.

In the midst of the sisters� dinner party, Maggie ditches her cooking duties to rush to the hospital. Meanwhile, April steps in to help cook as an attempt to avoid Jackson, and Arizona nervously waits to find out more about Callie�s new girlfriend.

Owen suggests the interns learn a vital lesson on how to break bad news to patients� families, and Arizona�s 90-year-old patient reassures her that she�s destined to find love again. Meanwhile, the sisters completely forget about the dinner party they�re hosting for everyone.

Maggie reevaluates her life choices after receiving an invitation to her ex-boyfriend�s wedding; Richard questions Bailey�s loyalty, and Jo confides in Stephanie about a secret she�s been keeping from Alex. Meanwhile, Alex struggles with making a difficult decision that will affect the lives of newborn twins.

The pressure is on as a determined Bailey tackles her first day as Chief; meanwhile, April's marriage is in jeopardy and she finds herself unable to address her problems; Meredith struggles to juggle all her responsibilities and Amelia works to define her relationship with Owen.

Seattle Grace Hospital springs into action to save the lives of two young girls whose powerful story will force some of the doctors to revisit the effects of bullying on their own pasts. Meanwhile, Meredith must adjust to changes at home with her new roommates while Bailey continues to fight for the Chief of Surgery position and Jackson prepares for April�s return to Seattle.

As the doctors continue to tackle an unfathomable crisis, they are reminded of what is important and are brought closer together.

The doctors of Grey Sloan Memorial Hospital are forced to put their emotions aside when a catastrophic event occurs.

Amelia struggles to deal with her pain months after the funeral; April and Jackson argue over her return; the doctors must put their emotions aside when a catastrophe occurs.

We see how Meredith and the doctors cope after they learn the news of Derek's death. Meanwhile, April makes a shocking decision that Jackson cannot understand, and Bailey and Ben argue over their future.

Derek witnesses a horrible car accident and springs into action to save lives.

A small plane crash in Seattle causes multiple casualties and brings back horrible memories for the doctors, especially Meredith and Arizona. Meanwhile, friction between Owen and Amelia makes for an uncomfortable working situation for Stephanie.

Upon realizing that Owen and Amelia have been seeing each other behind her back, Meredith comes down hard on her sister-in-law causing Amelia to rethink things. Meanwhile, Catherine springs into action when a man is brought into the hospital after his wife seeks revenge on his cheating ways.

A school field trip to the hospital takes a dramatic turn when the kids witness two injured cops enter the emergency room. Meanwhile, Stephanie sets her eyes on one of the chaperones, Callie operates on the leg of the police captain and Amelia must face her feelings for Owen.

Meredith, rattled by the latest events, tries to figure out what to do about Derek. Meanwhile, Owen is shocked when his mother is admitted to the hospital.

A patient's condition sparks a conversation between Richard and Maggie about Alzheimer's disease; April and Jackson struggle to return to their normal lives and Arizona is faced with the reality that Callie is moving on. Meanwhile, Meredith reveals her biggest fears about Derek.

An earthquake shakes the ground at Grey Sloan Memorial Hospital, trapping Maggie in an elevator and threatening Meredith�s long streak of successful surgeries. Meanwhile, Owen gives medical advice to a child over the phone and Ben confides in Jackson.

In this Amelia-centric episode, Amelia engages in the surgery of a lifetime as a crowd of doctors look on from the gallery. With Stephanie by her side, she begins operating on Dr. Herman, but quickly realizes it's far more difficult than she anticipated. Meanwhile, Bailey becomes skeptical when Arizona takes on one of Herman�s cases.

The hospital doctors become fascinated with Dr. Herman�s case when Amelia gives a lecture detailing the intricacies of the surgery. Arizona and Herman continue to bond over the amount of cases they are trying to complete before the big surgery. Meanwhile, Bailey brings them a case of a pregnant woman who is close to her heart.

Maggie gets upset when Meredith dodges her questions about DC; Bailey and Ben become concerned about Ben�s brother after he is admitted to the hospital, and Dr. Herman starts to warm up to Arizona. Meanwhile, Richard feels manipulated by Catherine.

After several discussions with Dr. Herman, April and Jackson must face their situation head on and make a difficult decision regarding their unborn child. Catherine arrives in Seattle and bumps into Richard at the hospital. Meanwhile, Meredith tries to find someone to take care of the kids so she can visit Derek for the weekend, and Amelia shows Stephanie some tough love when they work together on a case

April stays optimistic as Arizona begins testing on her baby; Dr. Herman plans out a crash course in fetal surgery; and Owen and Callie encourage each other to get back into the dating scene. Meanwhile, Meredith, Maggie and Bailey use the 3D printer to gain a better understanding of their patient's tumor.

As Derek prepares for his move to DC, Meredith keeps herself busy at the hospital. Meanwhile, Jackson and April deal with difficult news, and Arizona and Amelia discuss how to best approach Dr. Herman.

Maggie and Meredith disagree with Derek about the best way to approach a patient�s case, which leads to a bigger argument between the couple. Meanwhile Callie feels responsible when one of her veterans is pushed too far and one doctor�s routine procedure results in a devastating diagnosis.

Secrets about Amelia�s past addictions come to light and cause problems for her at the hospital; Bailey oversees Jo�s first solo surgery; and Arizona must make an executive decision in Dr. Herman�s absence. Meanwhile, the doctors spring into action when a couple arrives at the emergency room after escaping a fire.

Owen becomes invested in a patient when he realises she may have served in the military, April's mother pays her daughter a visit and bonds with Jackson, and Derek plans a family dinner. Meanwhile, a patient's diagnosis causes Bailey to reconsider her own health issues and Dr. Herman drops a bombshell on Arizona.

In this Callie and Arizona centric episode, the couple takes a look into the problems that have contributed to their troubled marriage. At work, Callie immerses herself in the Veterans� project, and Arizona struggles to impress Dr. Herman. Meanwhile, Richard leans on Bailey for advice.

Secrets from Ellis Grey�s past come to light when Meredith watches old videos and reads through her mother�s journals. Meanwhile, Maggie rocks the hospital with an unexpected announcement; Alex gets new responsibilities and Callie focuses her attention on the Veterans� project.

Owen tries to get Callie to help Veterans Hospital patients with the robotic limb lab. Alex and Meredith's friendship makes Jo jealous. Alex and Bailey prepare to go in front of the board.

In this Maggie centric episode, she continues to try to make a positive impression at the hospital but finds herself in extremely unfortunate situations. Meanwhile, Richard continues to hold onto his secret and the doctors work with a dying woman who is being kept alive by her daughter.

With Cristina gone, a new doctor, Maggie Pierce, making the rounds and Derek wanting to move to Washington DC, Meredith struggles to regain a sense of normalcy both at home and in the hospital. Meanwhile, Callie and Arizona come to a decision about surrogacy, Amelia overhears a big secret, Bailey realizes she will have to fight Alex for Cristina�s board seat and a freak accident causes two teenagers to be caught in a very compromising position.

The doctors of Grey Sloan Memorial Hospital bid an emotional farewell to the beloved Cristina Yang. A possible act of terrorism rocks Seattle and causes chaos at the hospital. Meanwhile, Meredith makes a life changing decision and one doctor receives shocking news.

With Derek away, Meredith spends time with Amelia and finds out her true feelings about her time in Seattle. Bailey deals with the ramifications of her actions and Callie receives devastating news. Meanwhile, the residents panic after hearing that one of them will be fired.

Cristina looks to Meredith for advice as she assesses her future at the hospital. Derek and Amelia work together on a difficult surgery involving conjoined twins. Meanwhile, Jo is spread too thin when she tries to work on several cases at once and Stephanie realizes the truth about Bailey�s bubble boy case.

Jackson is given the daunting task of delivering disappointing news to the doctors. Meanwhile, Derek's sister Amelia drops by for a surprise visit, Richard surprises Catherine in Boston and when Bailey gets frustrated by the slow pace of her research, she makes a risky decision.

Cristina enlists Meredith to help her prepare an acceptance speech for her possible Harper Avery win and while Owen offers to attend the ceremony with her, she insists on going alone. Meanwhile, Derek feels overwhelmed between his responsibilities at home and at the hospital. April and Jackson come to a disagreement on children and religion, and Callie and Arizona try to reconnect in their marriage.

Cristina is nominated for a Harper Avery and although most of her fellow doctors are ecstatic, she won�t let herself get too excited. Bailey continues to work on a young boy without an immune system -- Alex considers making a change, and Derek and Callie work with a machine that can recognize emotions. Meanwhile, Richard gives the residents a pep talk about the exciting projects going on around the hospital.

The hospital gets inundated with flu infected patients, which causes the doctors to slowly fall ill one by one. Derek must fight off the sickness as he prepares to give a speech on brain mapping and the residents place bets on who will fall ill first. Meanwhile, a new doctor at the hospital gives Alex a glimpse into an alternate form of medical practice.

Cristina imagines the two routes her life can take based on one decision she makes. Meanwhile one of the hospital�s patients decides whether or not to live.

It's Richard's birthday and Bailey invites him to scrub in on the case of a lifetime. Meredith hires a research assistant to help with her portal vein project. A scorned Callie gives Derek quite the shock. Meanwhile, Shane helps screen candidates for Cristina's clinical trial and meets a young expectant mother who needs his help.

Arizona has a bad day which escalates when she advises one of Callie's patients on a potential double amputation. Derek goes back on a promise to Callie, and Jo and Stephanie come across an abandoned baby outside the hospital. Meanwhile, the doctors deal with the repercussions of the non-fraternization rule, which include meetings with HR and one doctor's suspension.

After an anonymous complaint is issued by one of their own, the hospital implements a non-fraternizing policy causing the couples to panic. Meanwhile, Emma and Owen talk about the future, Cristina and Meredith enjoy a little girl time, and Richard enlists the residents to help research a rare cancer case.

The doctors face the consequences of the events that took place at April�s wedding. Meredith feels betrayed when Derek goes back on a promise, Alex is furious after returning to the hospital and hearing the news about his father, and Arizona and Callie decide whether or not to move forward together. Meanwhile, Bailey realizes she was wrong about the motive behind Ben�s decision to move back to Seattle.

On the day of April's wedding, the Grey Sloan Memorial doctors are all preoccupied with their own drama. Meredith and Cristina continue to argue about their research and careers, Bailey comes clean to Ben about her feelings regarding him moving back to Seattle, and Shane puts himself in a risky situation. Meanwhile, Derek gets a phone call that will change his life.

April�s sisters arrive to help celebrate April�s upcoming nuptials and quickly get on her nerves. Matthew and Jackson are forced to work together when they witness a terrible accident, Callie and Arizona work hard to reestablish their relationship and Cristina is pressured to live stream an upcoming surgery. Meanwhile, a familiar face returns to the hospital.

Ben worries that a casual conversation with Derek could potentially cause issues for Bailey, Cristina turns to Shane as tension grows with Meredith, and April's upcoming wedding makes for an uncomfortable situation between Jackson and Stephanie. Meanwhile, Meredith plans a Thanksgiving dinner at her house.

When an unexpected malpractice suit turns Callie's world upside down, her supportive father arrives and shares an interesting secret with her. Meanwhile, through flashbacks, we learn some surprising details about Callie and Arizona's marriage.

The issues between Meredith and Cristina hit a boiling point when one of them ultimately betrays the other at the hospital. Derek tells Jackson that he needs to let go and allow the second year doctors to work on his patients, and April and Matthew make a bold decision about their relationship. Meanwhile, Bailey has difficulties with Ben�s return.

It's Halloween and the doctors of Grey Sloan Memorial are hit with a barrage of spooky patients, which affects their own plans and puts one doctor�s well-being in jeopardy. Meanwhile, Derek collaborates with Ben on a new surgical technique and Richard angers Bailey when he asks a second year resident to perform his next surgery.

Derek and Callie work on a brain mapping project, Richard encourages the interns to use his physical condition as a learning tool and after a discussion with Callie, Meredith considers continuing her mother�s research. Meanwhile, Shane continues to feel guilty about Heather�s death.

Meredith jumps back into work but finds it hard to excel at both motherhood and being a surgeon. Stephanie tries to make a good impression on Jackson's mom, and Jo finds herself overly involved with her new patient. Meanwhile, Callie and Owen deal with an emotional situation regarding a patient.

The doctors of Grey Sloan Memorial throw a fundraising gala which turns wildly competitive after Jackson makes a rash promise. Back at the hospital, Bailey�s patience is tested when she has to deal with several extremely difficult patients. Meanwhile, Shane and Stephanie handle an incredibly busy ER by themselves and Alex reveals an emotional secret to Jo.

Derek and Meredith adjust to life at home with their newborn and Arizona tries to repair her marriage. Elsewhere, Jackson and Owen clash over financial issues.

The staff continue to assist those affected by the storm. Meanwhile, Callie makes a bold decision regarding her relationship with Arizona, and tragic news brings the doctors together.

The Grey Sloan Memorial Hospital doctors are faced with the devastation left by the storm. A giant mudslide in Seattle injures a group of first responders and citizens, causing the already short handed ER to spring into action. Meanwhile, Meredith is faced with a tough decision that will affect the life of a loved one, Callie is rocked by the reality of Arizona�s infidelity, and Richard�s life is in extreme danger.

Grey Sloan Memorial Hospital enters crisis mode as the storm rages, resources become scarce and patients flood in by the busload. Meanwhile, one of the doctors fights for their life.

The doctors of Grey Sloan Memorial Hospital prepare for a super storm heading towards Seattle. Owen's desire to be a parent gets stronger as he becomes closer to Ethan. One wrong move puts the lives of Meredith and her baby in jeopardy. Meanwhile, Jo looks to Alex for help in a moment of crisis, and one doctor gets the shock of her life.

The doctors reach out to Bailey but she continues to shut everyone out; after an incident with Ethan's grandmother, Owen fears the child could end up in foster care. A new craniofacial specialist arrives at Grey Sloan Memorial Hospital to work on a young patient. Meanwhile, a magician's assistant is rushed into the ER after a magic trick goes terribly wrong.

Bailey finds herself at the center of a CDC investigation surrounding the death of several of her patients, as Jackson and the rest of the board members argue over how to address the crisis with the public. Meanwhile, Cristina teases Alex about his unspoken feelings for Jo, and Owen continues to take special care of Ethan as the condition of his parents remains uncertain.

Upon receiving some unsettling news, Meredith and Derek take preventative steps for their children�s future; a group of Syrian doctors arrive at Grey Sloan Memorial Hospital for a crash course in basic surgical skills that they plan to apply in the field; and April decides to come clean to Matthew regarding the truth about her virginity. Meanwhile, multiple pre-op patients develop infections, causing one doctor to wonder if she is at fault.

A gas tanker explodes on a Seattle highway, causing multiple injuries, including paramedic Matthew. Meredith and Jo help a frantic mother whose child is suffering from a mysterious illness. Owen bonds with a young boy whose parents are in critical condition. Meanwhile true colors are revealed when Alex is forced to work with Jo's boyfriend on an ailing patient.

As the hospital continues to make positive changes under the new management, the doctors begin to realize that owning a hospital comes with its own set of problems and responsibilities. Meanwhile, Meredith worries about the wellbeing of her unborn baby, Callie and Arizona try to get the spark back in their relationship, and Alex gives Jo�s new boyfriend a run for his money.

The discord and chaos created by the hospital's new management team causes one physician to question his future at Seattle Grace. Meanwhile, the doctors and the interns must juggle several transplant surgeries at once, each coming with its own set of obstacles.

As word of Seattle Grace's financial trouble spreads, Catherine encourages Jackson to move to Boston, and the interns fear they might lose their jobs. Meanwhile, the doctors meet with a potential investor in a last-ditch effort to save the hospital, and Alex impresses Jo while caring for a patient.

As the hospital spirals closer to financial ruin, Owen must make some tough decisions, which includes foregoing an expensive surgery that could save the life of a child. Meanwhile, Alex and Jo work together to save the life of an infant, and April asks Jackson for dating advice.

Competition heats up as several of the doctors fight to become the new face of Seattle Grace; April brings in an emergency case, and Jackson and Alex work with a transgender teen couple. Meanwhile, the hospital implements new policies which test the patience of the staff.

As Derek and April work around the clock to find a solution for the hospital, Cristina struggles to respect the wishes of a family whose son is dying. Meanwhile, Arizona empathizes with a teenager who faces problems similar to her own.

The Seattle Grace doctors are on edge when a new medical professional enters the hospital; Arizona struggles with the emotional and physical pain of a phantom limb; and while battling pregnancy hormones, an overly-emotional Meredith is confronted with her worst fear.

Meredith, Derek, Cristina and Arizona receive big news regarding the plane crash lawsuit, Richard avoids Catherine's romantic advances and Jackson takes on one of Mark Sloane's old patients. Meanwhile, Derek begins recovery on his hand.

Bailey puts her wedding day on hold and continues her efforts to save Adele's life, Cristina and Owen remain undecided about their pending divorce, while Arizona and Callie try to get their spark back. Meanwhile, the hospital becomes inundated with a group of bikers after a horrible accident.

As the rest of the doctors prepare for Bailey's wedding, Richard helps her through a bout of pre-wedding jitters. Meanwhile, Lizzie butts heads with Meredith, and Callie and Jackson try to convince Derek to participate in a risky surgery that could fix his hand.

The new batch of interns find themselves involved in all the drama at Seattle Grace: Meredith asks Heather to go above and beyond to help fix Derek's hand; Cristina starts a healthy competition between Stephanie and Leah, which inadvertently leads to a medical emergency for Cristina's patient; Alex sees Jo in a new light as they work to save a baby's life, and April teaches Shane a valuable lesson during "lumps and bumps" duty.

Cristina and Owen continue to figure out their relationship amidst the pending lawsuit; and Bailey argues with Ben over plans for their upcoming nuptials. Meanwhile, Callie recruits Jackson to help find a solution to Derek's hand, but he is preoccupied by a shocking situation with April.

As the doctors continue with their lawsuit, they�re forced to confront the realities of their injuries. Meanwhile, Bailey tricks Arizona into helping her with a pediatric case, and Cristina tries to find normalcy in her new environment.

In this Meredith & Cristina-centric episode, the two friends continue to cope with life after the plane crash and their ever-growing responsibilities at their respective hospitals. As Meredith juggles taking care of Zola with a case that hits close to home, Cristina assists Dr. Thomas on a challenging heart surgery.

Aware that Derek might never operate again, Meredith stops talking about the surgeries she's performing. Meanwhile, Richard calls on Dr. Catherine Avery to help him perform a complicated procedure, as things continue to heat up between Jackson and April; and Arizona's struggle to accept her fate forces Callie and Alex to face their guilt.

The survivors from the crash are asked to make an almost impossible decision that will affect the rest of their lives. Meanwhile, tension grows between Jackson and April after they're forced to work together, and Alex tries to restrain himself with one of the interns.

In this flashback episode, return to the site of the plane crash and watch as each doctor tries to cope with the heartache and injuries caused by the crash. Meanwhile, back at Seattle Grace, everyone struggles to find a bit of normalcy amidst the chaos.

The doctors of Seattle Grace are faced with the aftermath of last season's plane crash. As they try to move on with their lives, they must learn to adapt to the changes, cope with their losses and move forward with their relationships and careers.

Faced with a life threatening situation, the doctors must fight to stay alive while trying to save the lives of their peers; Bailey and Ben make a decision regarding their relationship; and Teddy is presented with a tempting offer. Meanwhile, Richard plans a special dinner for the residents.

The residents determine their future as they make their final decisions regarding post residency positions; Mark admits to Derek that he is torn between his love for Lexie and the fact that Julia can give him everything he's ever wanted; Ben plans something extra special for Bailey, but she is preoccupied with her work; and Arizona encourages her childhood friend, Nick, to have surgery. Meanwhile a couple on their third honeymoon come to the hospital complaining of mysterious symptoms.

The residents agonize over their oral boards, reliving every answer they gave during their exams; Arizona's close childhood friend comes to Seattle Grace for medical help; the doctors work on a patient who is missing one third of his skull; and Julia asks Mark to start a family with her. Meanwhile Catherine tells Richard that one of his residents has failed.

After eight years of practice, the residents head to San Francisco for their oral boards; sparks fly between Catherine and Richard when they bump into each other at the hotel; Bailey intervenes after Owen and Teddy get into a heated argument about their young car crash patient; and Mark tries to recruit Lexie for one of his cases. Meanwhile, Alex feels guilty for being away from the hospital when Tommy's health begins to fail.

The doctors work on a Jane Doe, who turns out to be the subject of a case that gained national interest; Cristina proves to be the highest in demand as the residents begin their interviews for post-residency positions at prospective hospitals; and Richard is faced with an unsettling realization when he visits Adele at Rose Ridge.

A devastated Cristina presses Owen to confess the intimate details of his affair; Mark takes his new authority very seriously when he steps in as chief for the day and butts heads with Richard over a patient's liver transplant; and Callie deems Meredith ready for the boards, while the rest of the residents continue to stress about the exam. Meanwhile, Callie, Arizona and Bailey plan a much needed ladies night for Teddy.

A lion breaks loose in Seattle, leaving a couple's lives and relationship at risk; Lexie overhears Mark's discussion about moving in with Julia; Teddy begins to take steps towards coming to terms with Henry's death; Callie grills Arizona on her past lovers; and Alex requests to be taken off Morgan's preemie case when she becomes too dependent on him. Meanwhile, Meredith tries to be a support for Cristina as the tension between her and Owen hits a boiling point.

Derek encourages a hesitant Meredith to work with him again in neurology; Jackson's mother, Catherine Avery, returns to Seattle Grace with a urology fellow and develops an interest in Richard; and Cristina becomes increasingly suspicious of Owen's every move. Meanwhile, Alex tries to deny the fact that Morgan may be falling for him.

As Adele's condition continues to deteriorate, Richard considers altering their living situation; an explosion at a local coffee shop results in a busy day in the ER for the doctors; Callie takes Meredith under her wing by helping her study for her boards; Lexie joins Arizona and Alex in peds, as they continue to care for intern Morgan's premature son; and when Jackson snaps at a patient, Mark encourages him to find ways to relieve his stress. Meanwhile, Cristina lets her suspicions get the best of her.

Amelia arrives at Seattle Grace to beg Derek to help with the gliosarcoma case; Cristina and Owen have heated arguments during marriage counseling; Alex realizes he needs to improve his people skills in order to be a good doctor.

In the spirit of Valentine's Day, Meredith and Derek try to have a night to themselves when Lexie offers to watch Zola; Callie hands babysitting duties over to Mark so that she can surprise Arizona with a romantic evening; and Ben proves to Bailey that he knows her better than she thinks. Meanwhile, the ER fills with romantics, including a 10-year-old girl who has an allergic reaction to chocolates from her valentine and a man who is hit by a car while chasing down his frustrated girlfriend.

As Meredith puts Zola to bed and falls asleep, she begins to wonder -- what if her mother had never had Alzheimer's and she'd had loving, supportive parents? The reverberations of a happy Meredith Grey change the world of Seattle Grace as we know it. What if she had never met Derek in that bar and he had never separated from Addison? What if Callie and Owen had become a couple long before she met Arizona? And what if Bailey never evolved from the meek intern she once was?

Richard performs a monumental surgery in his career; Derek and Lexie attempt to work miracles for a patient with an inoperable tumor

The doctors split into teams for a risky surgery involving conjoined twins; Bailey recruits Meredith to be a buffer between her and Ben when he puts pressure on moving their relationship to a more serious level; Richard teaches Alex a tough lesson in the OR; meanwhile Teddy questions Cristina about what exactly happened to Henry during his surgery.

A severe car crash involving an entire family results in an all-hands-on situation in the ER, as the eldest daughter is left to make the toughest decision of her life. Meanwhile Teddy, still in the dark about Henry's death, calls upon Cristina to help with her patient in the O.R., and Lexie finds herself working alongside Mark's new girlfriend, Julia, during an eye surgery.

Teddy puts her husband�s life in the hands of her peers when Henry is sent to the OR for surgery and she�s called away on another case; Meredith and Derek receive the long-awaited news about Zola; Callie and Jackson come under fire when their patient experiences post-surgery complications; and Meredith and Alex are involved in a life-threatening situation when they travel to a neighboring hospital to tend to a sick newborn, on Grey�s Anatomy

The doctors become nostalgic when George O'Malley's mother, Louise, returns to Seattle Grace for medical help after a botched surgery at a neighboring hospital; the residents are inspired by a medical miracle when they witness a harvested heart that continues to beat outside the body; a new pediatric fellow excites Arizona and makes Alex feel threatened; Jackson lets his suspicions about Mark and Lexie interfere with his work; and Henry and Teddy have their first marital fight when he expresses interest in pursuing medical school

Owen stresses teamwork and moves his leadership role over to the baseball field when he signs the doctors up for a baseball league, pitting them against their biggest competition, Seattle Presbyterian; Lexie tries to hide her jealous rage when she sees Mark with a new woman, but her emotions get the better of her; Alex fights to keep Zola at Seattle Grace after it is suggested that she be moved to another hospital due to a conflict of interest with Meredith and Derek; and Richard scolds Meredith and Bailey for their feud

After being blackballed by most of the surgeons, Meredith uses Lexie to spark Derek's interest in her patient's rare brain tumor case and, in secret, gives guidance to April with Bailey's clinical trial; Callie's wish for Arizona and Mark to form a friendship comes to fruition and she realizes it's more irritating than helpful; Alex and Teddy research alternative surgeries for a very superficial patient; and Callie and Cristina struggle with a very difficult spinal surgery.

The residents try their hardest to impress surgical great Catherine Avery-who also happens to be Jackson's mother-when she arrives at Seattle Grace to perform a groundbreaking transplant surgery; Arizona and Alex find their hands tied with a confidentiality issue when a familiar patient comes into the ER; meanwhile, a love-struck Teddy throws a dinner party for the couples, and Bailey makes a decision regarding her love life

A stampede at a comic book convention leads to an influx of colorful characters in the ER; Mark continues to make life difficult for Jackson; Ben returns and realizes Bailey has moved on.

The chief makes a decision that shocks everyone at Seattle Grace; Owen and Cristina attempt to find normalcy; April struggles in her new role; the 5th-year residents receive their first solo surgery assignments.

News of Meredith and Derek's unsteady relationship raises a red flag for Zola's adoption counselor; Alex quickly realizes that he has become the outcast of the group after ratting out Meredith; and Cristina makes a tough decision regarding her unexpected pregnancy. Also, Chief Webber brings Henry in for a last minute surgery, alarming Teddy. This is an historic episode that finally crosses a long-standing barrier.

The fifth-year residents return for the first day of a year that will make or break their careers: Meredith faces the consequences of tampering with Derek's clinical trial and is terminated at the hospital; April tries to step up to the plate as Chief Resident in the wake of a giant sinkhole in the middle of Seattle; and Cristina and Owen are still at odds over their drastically different feelings for their unborn child.

News of Meredith's dishonesty in the clinical trial comes to light, leading to unanticipated consequences for her and others; Cristina finds herself in a compromising situation, which forces her to decide between her career and her relationship; Owen posts his decision for Chief Resident, and Teddy makes a surprising choice regarding her love life -- and her future.

Personal and work pressures are adding up and have Meredith visibly on edge, Owen conducts formal interviews for the Chief Resident position, Cristina grows increasingly defiant, Alex and Lucy's undefined relationship gets tested, and Jackson suddenly backs out of the Webber's diabetes trial.

As Callie and Arizona's wedding approaches, the couple quickly realize that the day they've been looking forward to is not turning out the way they'd envisioned. Meanwhile Alex continues to make the other residents jealous as he appears to be the top contender for Chief Resident, Meredith and Derek make a decision that will change their lives forever, and Dr. Perkins presents Teddy with a very tempting proposition.

Everyone pulls together to help Callie and baby Sofia on their painstaking journeys to recovery in hopes of allowing mother and baby to finally meet; the sudden death of a clinical trial patient has Derek proceeding with more caution while Meredith makes a calculated and risky move; Alex treats a cranky old rich woman dying of cancer and gets an idea for a grandiose endeavor that is sure to get him the Chief Resident spot; and Teddy is pleasantly surprised by the return of a familiar face.

A cataclysmic event leaves the doctors shaken; Callie, on the verge of a life-changing moment, starts imagining about the hospital and her friends.

Richard is desperate for Derek and Meredith to accept Adele into their Alzheimer's trial, but will Adele stand in her own way? Meanwhile Mark and Arizona have conflicting ideas of the kind of baby shower Callie wants, Teddy is freaked out when Henry has another health complication�leaving them both a little exposed�and the competitiveness amongst the residents for the Chief Resident position is amplified when Richard receives the green light for his diabetes clinical trial.

Meredith must choose between her fertility treatments and her eyesight when she begins having trouble seeing, Mark makes it clear to Callie and Arizona that he takes his role as father-to-be very seriously, and April discovers there's more to Dr. Stark than first appears.

Meredith, looking to prove she is Chief Resident material, learns that anything and everything can happen in an hour's time when she steps up to run the ER for a night; meanwhile, Bailey sneaks off with Eli and gets into a little mischief, and everyone is surprised when the Chief's wife, Adele, shows up as one of the ER patients.

Thatcher Grey, Meredith and Lexie's father, returns to Seattle Grace with stomach pains and a new, twenty-something tattooed girlfriend, Danielle. Meanwhile, Alex clashes with the new OB, Dr. Lucy Fields, over a patient and Mark places Jackson on his service in exchange for information on Lexie.

Derek breaks ground on his Alzheimer's clinical trial and Meredith can't help but feel left out; Bailey's attempt to take the hospital into the age of new media with live tweets from the OR does not go over well with the Chief; and Callie, Mark and Arizona must learn to navigate through the pregnancy together, which starts off with Callie driving her new obstetrician crazy.

Arizona tries to reconcile with Callie, who has big news to share; Teddy faces an important decision; the residents receive new interns; the Chief makes an announcement.

A gunman opens fire at a local college, sending mass casualties to the hospital; Arizona's return is not warmly received.

Derek takes Cristina out on a fishing trip; Teddy tries to help a patient who lacks the proper insurance to seek medical treatment.

The residents are on their own with the dreaded night shifts while the attendings go out to play to celebrate Derek's grant for his clinical trial.

A team of doctors tries to save the life of a political figure from the Middle East; Cristina decides to decorate her new place and throw a housewarming party; Alex shows up late to his first day of rounds with the new pediatrics attending.

Owen puts the residents through a rigorous trauma certification drill; Cristina is left alone to monitor an ill lung transplant patient.

A documentary crew visits the hospital six months after the shooting to document the road to recovery for doctors and patients; Meredith helps Cristina put on a brave face for the cameras.

As part of their training, Seattle Grace's residents are put in charge; the attending surgeons compete for a million-dollar grant.

Derek and Meredith visit the obstetrician and receive disturbing news; Lexie notices April and Meredith growing closer; Jackson tries to get ahead in the operating room.

Issues surface when Derek's estranged sister, Amelia (Caterina Scorsone), visits unexpectedly; Meredith and Derek continue to try to ease Cristina back into surgery.

Meredith finally tells Derek about her pregnancy and miscarriage; during a surgery, Cristina experiences PTSD; Bailey won't let Alex operate until he has the bullet in his chest removed.

In the wake of the shooting at Seattle Grace-Mercy West, the doctors find themselves in a frenzy: Christina and Owen will be getting married, and others are trying to deal with the recent blood bath. Derek is arrested for speeding!

Cristina and Meredith's surgical skills are put to the ultimate test.

Seattle Grace Hospital is hit with a crisis like no other in its' history.

An elderly patient admitted into the E.R. for a heart condition sees a familiar face, a long lost love who happens to be in the E.R. as well for a fractured arm, and the staff find themselves caught up in their love story. Meanwhile, Karev treats a troubled teenage patient (guest star Demi Lovato) whose parents brought her in for schizophrenia, and Meredith can't help but tell Cristina about her suspicions of Owen -- which inevitably messes with Cristina's head.

Bailey preps the team with mandatory sensitivity training prior to admitting a 700-pound patient with compounded medical issues, and the case proves to be challenging in every sense of the word. Meanwhile Derek has to come face to face with a former patient's husband in a wrongful death deposition, and spending time with a heart patient's daughter opens up some old wounds for Cristina.

Sloan returns to Mark's apartment, just as she's going into labor, and Teddy, Mark and the still-fighting Callie and Arizona are there to help with the birth and to get Mark through his grandson's pending adoption. Meanwhile Teddy sees Derek's invitation to illustrious cardiothoracic surgeon Tom Evans' as a threat to her future employment at the hospital, and the team work on a crab boat captain who has been stabbed with a giant shark hook.

When Alex's younger brother, Aaron, shows up at Seattle Grace-Mercy West with a hernia, it's up to Alex to get Bailey's approval for his pro bono surgery. Matters are further complicated when Aaron discloses that his family has not heard from Alex since he arrived in Seattle, and parts of Alex's past long kept secret are revealed to his friends and fellow doctors.

When Teddy's patient seeks to end treatment and her life, she turns to Hunt for help. The situation triggers Hunt's memories of his life at war and his past relationship with Teddy. Meanwhile, Callie and Arizona have a difference in opinion on what their future holds, and Richard tries to adjust to his role as a surgeon.

A patient who needs an extremely difficult surgery comes to Seattle Grace, and it's Richard and Owen who vie for the opportunity to tackle it. But the decision lies in the hands of Derek, who deems that Owen should take on the surgery, leaving Richard bitter. Meanwhile, Bailey deals with her own personal struggles when she nervously prepares for another date with Ben.

When famous surgeon Dr. Harper Avery is rushed to Seattle Grace-Mercy West, the staff is surprised to discover that one of their own is related to this legend, and his unorthodox request for his surgery causes tensions t between Derek and Richard. Meanwhile Callie and Arizona try to help Teddy and Sloan move on from their pasts and find greener pastures.

In his new role as Chief, Derek restores the hospital lecture series, and Richard, Bailey and Callie present to the group pivotal surgical cases from their pasts Bailey reflects on her first days as a shy resident, Callie looks back on a polio case, and Richard recalls a case in which he and Ellis worked on a patient diagnosed with GRID, a virus later called AIDS.

It's Valentine's Day, and the doctors must treat dozens of injured people after the roof collapses at a popular romantic restaurant; Derek tries to manage his busy schedule as Chief of Surgery; Meredith wrestles with her new duties as the Chief's wife; and Mark and Callie team up to convince Sloan to do the right thing for her baby.

As Derek begins his role as interim chief, he faces a potential lawsuit when Bailey and Meredith's patient awakens from anesthesia mid-surgery. Meanwhile, Teddy refuses to place Cristina on her service, as Arizona tests Alex out in Pediatrics, and Mark refuses to speak to a heartbroken Lexie.

After learning of Richard's drinking problem, Derek confronts him for the sake of his friend and the hospital, Izzie returns, hoping to reconcile with Alex, and tensions run high between Teddy, Cristina and Owen in the aftermath of Cristina's startling confession.

Mark flies Addison to Seattle to help with a difficult procedure on his pregnant daughter, Sloan, Owen questions Teddy's motives when she assigns Cristina the lead on a complicated surgery, and Derek's suspicions are raised when the Chief recruits Meredith to assist with a high profile operation on.

As Thanksgiving, Christmas and New Year's pass, Miranda gets a visit from her father, William who disapproves of her choices in life. Mark and Lexie cope with an arrival of a woman from his past. Thatcher questions the Chief's recent behavior as Meredith comes to his defense.

Owen recruits Dr. Teddy Altman, a former Iraqi veteran, as the new cardiothoracic surgeon. Cristina questions her abilities in the E.R. and relationship with Owen. Izzie returns to Seattle Grace with her high school mentor seeking treatment for his dementia. Richard's responsibilities, post-merger, are taking a toll on him.

A generous 25 million donation is offered to Seattle Grace by the parents of Arizonas 10-year-old patient, she finds herself in a conflict of interest when his condition worsens. Cristina tests her boundaries with Owen at the hospital. Alex is left with all of Izzies hospital bills to contend with.

When Isaac has an inoperable tumor wrapped around his spine, he wants Derek to do the impossible. Derek tests the Chief's authority when Richard objects to moving forward with the risky surgery.

After a burn victim unexpectedly dies in the midst of a chaotic ER, the Chief and board member Jennings interrogate the residents to find the culprit, as all the Mercy West and Seattle Grace resident defends their actions in an effort to save their jobs.

The residents of Seattle Grace and Mercy West vie for surgeries and their careers as day one of the hospital merger begins. Meanwhile, Arizona stands by an enraged Callie when her father, Mr. Torres, employs a priest to help convince her to date men, and Izzie experiences the brunt of her new surgical competition.

When Meredith and Lexie's father, Thatcher, returns to the hospital with a failed liver, it's up to Meredith to save his life. Meanwhile, Izzie empathizes with a patient riddled with tumors, as Mark, annoyed with Cristina's competitive zeal, tricks her into assisting on an unusual surgery.

Several weeks after her near-death experience, a recovering Izzie returns to work. Meanwhile, nervous that there will be layoffs in the hospital in the wake of an announcement from the Chief, the Seattle Grace residents compete to survive the cuts, including Cristina, who attempts to work alongside Arizona in pediatrics. And Bailey and Alex's patient's already complex case is further complicated by her schizophrenic son.

Everyone is struggling after losing one of their own and are turning to any distraction they can find. Meredith and Derek seem to be consummating their marriage anywhere and everywhere, while Cristina and Owen have been instructed to abstain from sex by Dr. Wyatt.

The hospital staff is left to deal with the aftermath of George's passing. Hitting the staff hard, they all find unique ways to get through the various stages of grief. George's mom returns, faced with the difficult task of deciding what to do with his organs.

In the second part of the two hour season finale, George delivers stunning news to Bailey, sending shockwaves throughout the hospital, and Izzie's friends anxiously await her recovery from surgery. Meanwhile Bailey is surprisingly displeased after being accepted into the pediatric fellowship program, and the victim of a near-fatal traffic accident brings the talents of Seattle Grace's doctors together. This is the second hour of a 2-hour season finale.

In the first part of the two hour season finale, Izzie spends time with a fellow cancer patient and contemplates whether or not to undergo a risky surgery, as Mark is ready to take his relationship with Lexie to the next level and a patient makes Owen reassess his place at Seattle Grace.

As Meredith, Derek and all of their friends prepare for the big wedding, a group of college students, injured in a car crash as they were heading to their graduation ceremony, is admitted to the ER. Meanwhile, Izzie fears the worst when she begins experiencing familiar symptoms.

As preparations continue for Meredith and Derek's wedding, Izzie receives a surprise hospital visit from her handful-of-a-mother, Robbie. Meanwhile, a newly sober Thatcher visits his daughters, Meredith and Lexie, in order to make amends, and the Chief and Meredith bitterly fight over a controversial medical case.

As she endures aggressive treatment for her cancer, Izzie throws herself into planning Derek and Meredith's wedding.

All eyes are on Derek as he is set to perform his first surgery after his breakdown; attention is also set on Izzie, whose medical condition requires her to undergo a difficult surgery; and Owen has another PTSD episode that injures Cristina and traumatizes both of them, throwing the future of their relationship into question.

After his fellow surgeons try and fail to bring Derek back to work, Meredith must summon the strength to convince him. Meanwhile the hospital is abuzz as Mark attempts a rare face transplant surgery. Cristina, at last awarded her first solo surgery, is more focused on the needs of her friends, and Izzie does her best to keep her medical condition a secret.

Derek decides to quit after learning that more of his patients have died than survived; Izzie's interns make an unsettling discovery about "Patient X."

Derek's confidence is shaken like never before as he faces off with Addison over what course is best for their dying pregnant patient; Cristina calls the abilities of a renown surgeon into question after she botches a standard procedure; and Bailey, who has decided to pursue a fellowship in Pediatrics, is appalled by the Chief's less-than-stellar recommendation letter.

Addison, Naomi and Sam rush the ailing Archer to Seattle Grace and reunite with old friends Derek and Mark to help save his life; meanwhile, Izzie employs her fellow doctors in a medical game designed to help teach the interns, and Owen runs into a significant someone from his past

Now that Derek has the engagement ring, he searches for the perfect way to propose to Meredith, as Lexie demands that Mark go public with their relationship, and Bailey, encouraged by her work on recent cases and by Dr. Dixon, considers a new direction for her medical career.

Bailey grows desperate as a patient's condition becomes more and more dire. Everyone in the hospital is stepping up to try to find the boy a new organ donor, including Meredith, who considers a death row patient's wish to die before execution. Meanwhile, an injury leaves Mark in a compromising position in the OR and Cristina awkwardly avoids Owen.

Derek's mother, Carolyn, makes a surprise visit to Seattle and meets Meredith for the first time, as Mark tries to conceal his relationship with Lexie from her as well; meanwhile, death row inmate William wishes to donate his organs to Bailey and Arizona's patient, as Owen and Cristina try to go on their first date.

Bailey teams with Seattle Grace's new pediatric surgeon, Dr. Arizona Robbins, to save the life of a young patient near and dear to her heart, as the admittance of a death row inmate at the hospital stirs anger in Derek and further erodes Meredith and Cristina's friendship; meanwhile, Callie and Sloan work as a team to fight their respective attractions to Sadie and Lexie, and Izzie tells Alex that she's seeing Denny.

Cristina is awarded the first solo surgery among the residents, but she is forced to give it up and choose her replacement; Lexie is impressed when Mark performs a cutting-edge procedure; Callie doesn't know if Sadie is friendly or flirtatious.

Meredith, Cristina and Bailey come to Lexie and Sadie's rescue when a routine surgery goes horribly wrong, as Owen and Derek treat a man seriously injured while sleepwalking and Mark comforts the sleepwalker's distraught daughter.

One of Meredith's oldest friends, Sadie, becomes an intern at Seattle Grace, but Mer's friends are less-than-welcoming to her.

When the Chief makes an announcement that a solo surgery is up as an award, the residents are sent into a frenzy all trying to get an edge over one another. Meanwhile, Derek asks Bailey for advice after Cristina continues to interfere in his relationship with Meredith. Elsewhere, Erica uncovers a shocking connection between a resident and a patient.

The chief gives Bailey new power and responsibility. He also gives her a very difficult surgical assignment: remove a girl's inoperable tumor. Meanwhile, new trauma chief Owen (Kevin McKidd) challenges the attendings' methods and the residents' skills.

Bailey heads up a "domino procedure" in which each surgery hinges on the one preceding it. Meanwhile, Derek gets sole credit for the brain-tumor study he did with Meredith; Lexie tries to get George to notice her romantically; and Sloan counsels a desperate Callie in the ways of love.

Meredith is sent into a state of panic when Derek finds her mother's diary in the house. Meanwhile, Callie stresses while preparing for her first date with Erica. Later, Cristina stumbles across a part of the hospital no one has ever seen before.

When the plumbing springs a leak, chaos breaks out at Seattle Grace as the Chief tries to put in place new teaching methods. Meanwhile, George takes his residency exam; and Derek attempts to get Meredith's roommates to move out, much to their surprise.

Alex is offended when Izzie talks about how great a man Alex is to Meredith. Derek is stabbed with the scalpel in the palm of his hand by Rose, while the Chief is stunned over Mercy West's increase in the number of patients, a deadly ice storm ravages Seattle.

As Meredith and Derek begin to find that their "happily ever after" is anything but easy, Cristina develops a crush on a military doctor who brings in a trauma patient. Meanwhile, the Chief and his staff cope with the news that Seattle Grace is no longer considered a top-tier teaching hospital.

Meredith and Derek get one last shot at success in their clinical trial; the surgeons work together to free a boy from a block of cement; Izzie helps Alex care for Rebecca; Lexie uncovers critical information about George's status as an intern.

A couple undergoes surgery. Derek and Meredith's clinical trial gets a second shot from a new patient. Izzie helps Alex. McSteamy hooks up with someone.

Dr. Wyatt refuses to let Meredith give up on therapy. Alex learns something else about Rebecca. The Chief wants Erica to perform a daring surgery. Christina continues to act strange.

The clinical trial continues to make progress. The anti-McSteamy club creates new initiatives but that isn't enough to stop one woman from spending time with him. Christina is affected by Burke's career developments.

Addison visits Seattle Grace because they need skills that only she has. Rebecca/Ava returns with news for Alex. Meredith and Derek's clinical trial experiences one or two developments.

Time has passed but not much has changed. Sexual angst still runs rampant in the halls of Seattle Grace. Derek and Rose have been dating and Meredith has noticed the activities of her current off-again ex-boyfriend. The doctor's are in the midst of a competition.

George has a surprise visitor. Bailey's family is falling apart. Derek sorts through what kissing Rose means. Meredith discovers something that doesn't inspire hope or happiness in her. Alex treats a faith healer.

Meredith works furiously to save a paramedic trapped in an ambulance; Lexie holds the life of a patient in her hands; Derek must rely on a nurse to save a patient; Bailey struggles to balance her personal life with her work.

An ambulance crash endangers the lives of the paramedics involved, as Meredith and the Chief work on-site to save them, Bailey treats a patient who refuses her help, and Ava returns for Alex and meets his other girlfriend in the process.

There has been a bus crash and the patients are in the ER. Meredith and Derek's relationship gets more complicated when he dates a fellow doctor. Meredith's dad goes to visit her at the hospital.

Two arguing parents, who are named Jane and Don, bring their son in because he swallowed coins, while a middle aged woman comes in wanting cosmetic surgery on her chin. A father worries about raising a child alone when the mother needs surgery.

A patient comes to the ER with a dream and a condition which may prevent him from realizing it. Two patients are competing to win something big. One of them convinces an intern to take their place.

It's Halloween at Seattle Grace! There may be jokes, pranks, and/or scare tactics. Some of the women form a club based on an experience they all share. A man volunteers for what most of the doctors believe is an unnecessary surgery. One of the patients is in the hospital because they tried to carve a pumpkin in an unconventional manner.

A face familiar to one of the year-twos shows up and dredges up issues that were never really dealt with. A teen soccer player needs counseling because of his father and surgery for an injury he sustained while playing the game. Another patient's, named Courtney, finds out that her cancer is back.

The doctors meet the world's oldest intern. Marcy brings in her son Henry because she finds his change in behavior suspicious. A patient named Connie may lose her vocal chords unless Mark and Richard can perform a radical new surgery. George impresses the other interns at work but at home he is trying to deal with his guilt about having sex with Izzie.

A patient is in the hospital because they fell asleep in a hazardous situation. A patient's home laboratory blew up in an apartment building and the victims flood the hospital. Alex investigates the cause of the incident by talking to a really old guy who lived in the building. Jane Burke shows up to deal with what her son left behind. Lexie tries to talk to Meredith. Callie is overwhelmed by her new position while Bailey is searching for things to do.

Entering their first year as residents, Meredith Grey, Cristina Yang, Izzie Stevens and Alex Karev now have interns of their own to mentor. Among the new interns are George, forced to repeat his internship after failing his exams, and Lexie Grey, Meredith's half-sister. Another two new interns will be introduced in this season premiere. And they'll have their hands full when a three-car accident sends multiple casualties pouring into Seattle Grace. Some of the doctors need to deal with new stressed out interns. A young boy brings his bleeding deer to the hospital in the hope a doctor will save her.

Callie and George make a big decision. A successor to Chief Webber is named. A man named Jeff Pope arrives. He is looking for his wife and newborn child. Cristina and Burke's wedding day has arrived and so have the interns first-year exam results.

The interns finally take their first year medical exams, the biggest test of their careers, and one of them is ill-prepared. Callie grows more suspicious of George and Izzie. The doctors treat a patient named Dale. Three mountain climbers are treated. Cristina works on her vows. Adele wants Addison to keep a secret from Richard.

Meredith works on her relationship with Susan and Thatcher. Cristina has to deal with her mother and Burke's. Alex continues to tend to Jane Doe/Ava. Meredith and Derek's relationship has a problem that needs resolution quick. Addison sees her god-daughter which leads to a job offer outside of Seattle. Derek has to perform surgery. Burke has a reservation about marrying Cristina. Many new people guest star in the course of Addison's road trip to California. Addison considers moving to be closer to her old med school friends until she discovers that drama she wishes to leave behind isn't exclusive to Seattle. Her friends who she thought had it all, are divorced. A pregnant woman must discover who the father of her child is. This two-part episode serves as a backdoor pilot for Private Practice.

Meredith works on her relationship with Susan and Thatcher. Cristina has to deal with her mother and Burke's. Alex continues to tend to Jane Doe/Ava. Meredith and Derek's relationship has a problem that needs resolution quick. Addison sees her god-daughter which leads to a job offer outside of Seattle. Derek has to perform surgery. Burke has a reservation about marrying Cristina. Many new people guest star in the course of Addison's road trip to California. Addison considers moving to be closer to her old med school friends until she discovers that drama she wishes to leave behind isn't exclusive to Seattle. Her friends who she thought had it all, are divorced. A pregnant woman must discover who the father of her child is. This two-part episode serves as a backdoor pilot for Private Practice.

The attendings vie to be Chief. Two people who haven't slept together before, will. McSteamy's 60-day vow of chastity has a conclusion. We meet a boss, his assistant, and his wife. We also get to see someone being treated in the clinic. Derek has more questions about his relationship with Meredith. The chairman of the hospital board is admitted as patient. Callie confronts Izzie about her relationship with George.

Colin Marlow continues to try to get in the way of Cristina and Burke's relationship. The daughter that Izzie gave up for adoption needs something from her. This episode features a pro chess player, a flirtatious woman, and a mother named Mrs. Malone. Mr. and Mrs. Malone haven't talked to their daugther in a while because of their son-in-law. Someone goes to see a priest.

Callie's father comes to Seattle Grace and meets George, the hospital starts interviewing candidates for the Chief's position, and Alex helps Jane Doe figure out her place in the world. George and Izzie have a few morning-after symptoms.

Alex grows closer to Jane Doe as he continues to work on her case. Helen Crawford flies into Seattle for surgery. She knows someone on the staff. Colin Marlow enters the race for Chief of Surgery. George faces more problems with Callie and Izzie. Callie reveals a big secret. Someone treats a WWII veteran. Also Derek treats a patient near and dear to him.

Everyone is pushing for Meredith to survive, or in this case to be revived. People are still dealing with the fallout from the ferry disaster. A young man named Lucas is having problems with brain-mouth coordination. Someone else dies.

Almost everyone searches for Meredith while they ponder her place in the world. Addison considers pursuing Alex. Izzie takes desperate measures to manage the situation she is in. Someone ends up on the brink of death. Cristina and Burke have a blow-up fight about their announcement.

The staff is trying to deal with antsy patients while dealing with a major disaster when a cargo ship strikes a Ferryboat in Seattle. The Chief must choose a team to go out on location and save what is left of the few lives spared.

The chief's announcement of his retirement sparks competition between Derek, Burke, Addison, and Mark. A surgical patient endangers the lives of those surrounding her. Meredith's mother becomes lucid. Cristina and Callie consider marriage proposals. The Denny Duquette Memorial Clinic opens and Izzie cannot wait for the first patient to arrive.

George has become a sex machine. Dr. Bailey has the idea of opening a free clinic. A doctor at Seattle Grace gets proposed to. Addison is avoiding Alex. The Chief officially announces his intention to retire to the administration of Seattle Grace and to Adele. Rumors of Richard's retirement spread throughout the hospital. Two best friends are left with a difficult decision due to an advanced illness. Derek yells at Meredith.

Cristina and Burke continue to play Uncle until one of them gives in. Derek and Meredith are fighting over the reason for their sleepless nights. Meredith tries to talk to her father about his side of the story. There's tension between Alex and Addison. There is even more tension between Addison and Mark. Addison confides in Callie. Bailey wishes she didn't have to keep a secret from one of the interns. Callie rushes to be with George after she learns that his dad needs an emergency procedure. Izzie may have found 'some good to do' with her inheritance.

Meredith discovers that Derek has a problem sleeping while her father comes to visit the hospital. George's father is moving from one surgery to another. A patient named Heather checks into the hospital. Heather is 17 and has a nasty attitude that results from her medical condition and all the surgeries it has required her to have. Izzie has an emotional breakdown when she tries to hand over something very important to her. George's family comes to visit to celebrate his father's surgery. Cristina and Burke are playing Uncle.

Recent events strain Burke and Cristina's relationship. Mark and Derek must work together when two close-knit brothers seek medical help. One of Meredith's half sisters is admitted to the hospital.

A traumatic car accident fills the ER. Izzie pushes the boundaries of her probation. Cristina has a crisis of conscience about her deceptive teamwork with Burke.

George's father has a serious heart problem that requires surgery and George chooses Burke to do the procedure. Burke doubts himself because he knows the pressure this kind of surgery will put on him, but Cristina believes the team can handle it. Derek works with Meredith on being a couple again and tries work with Addison on more civil terms. A patient has had mutiple plastic surgeries so that his girlfriend will like him more. A mom wants her daughter's babysitter fired, after she is brought in with multiple injuries, but the girl likes the babysitter more than her mother.

The men of Seattle Grace go on a camping trip together, Addison and Callie must team up to work on a patient, Meredith assists Sloan with a procedure unlike any she has experienced, and, suspicious of her recent actions at the hospital, Bailey confronts Cristina. A 9-year-old is seen by Cristina after he swallowed Monopoly game pieces. A pregnant 25-year-old, is brought in after she slipped in the shower. She doesn't want medicine to take away the pain from her injury so not to put her baby's growth in jeopardy. Doctors take care of Daniel, a man who wants a sexual reassignment surgery and who now goes under the name Donna. Accompanying Daniel is his wife of the past 10 years, who was surprised to see him want that surgery but, after much struggling, decided to stay by his side.

Cristina gets to scrub in on a rare surgery which incites envy. Alex questions his future in plastics. George and Addison work together with Noelle. Noelle is pregnant with twins but one of them is growing slower than the other. Her fianc� has problems of his own. Derek's sister visits. A patient's wife makes things hard on the staff since she has made her husband's health her job. A woman's sexual exploits are questioned.

Derek learns one of Addison's secrets. Bailey talks about motherhood and depression to a mother who is set to have cancer surgery and who seems to not care about any decisions concerning the future. A resident is fiercely questioned about the death of a male patient. An ex-couple meet before lunch and get stuck - Meredith and Addison work on their case. Things get awkward when the ex-couple's daughter, Michelle, arrives at the hospital.

Shawn Sullivan, a car salesman who just had surgery, wants to get back to his routine so he doesn't lose his renown. Addison works with a pregnant woman named Rebecca who may need a C-section and Addison doubts her medical skills. Rebecca wants to have the baby naturally. Derek and Mark's opinions clash when the try to decide the course of treatment for a burn victim. Izzie gets surprised. Cristina pushes Burke to get better faster.

The staff tries to prevent a patient from getting an elective surgery. Cristina tries to help Preston cope with the after effects of his surgery. A patient bails on their surgery. Someone goes to a bed-and breakfast. Alex deals with a patient who has had a high amount of injuries in the past. A man undergoes surgery. Before the surgery his wife was only somewhat supportive, but the results may be too much for her to handle. Izzie tries to go back to the hospital for the first time since Denny died. One child's constant visits are noted by a nurse. Two foster patients are met with suspicions of child abuse. George and Callie's relationship moves forward.

Cristina meets Burke's parents, the interns try to get Izzie's job back, and Addison takes a day off, a surgical patient may be living her last day. Some of the interns want to know why Bailey won't talk to Izzie. Meredith tries to decide between Derek and Finn and comes to a decision somewhat. Webber finds out that Callie has been living in the hosiptal and he confronts her about it.

Meredith must make an important choice about which path she wants to follow to determine the future of her love life. While she considers her future she and others have flashbacks of their pasts. Cristina spends time with Burke while he recovers. Webber and Adele have a conversation after he spends the night at the hospital. Everyone attempts to deal with Izzie's choice to quit. George seeks relationship advice from Derek.

This episode is the second part of a two-hour season finale. Richard tries to get information from Addison about a family member's condition. Callie and George have a talk about his feelings. Meredith and Derek have a talk about Doc.

Denny needs a heart or else. Izzie and George go crazy trying to get him one. Derek has the life of a friend in his hands as he operates on Burke who has been shot. Burke cannot operate on Denny after Denny's heart stopped and now Denny is in a dire condition. Cristina gets put in charge of the ER and she is worried about Burke.

George and Derek work together, Denny still doesn't have a heart, and Meredith gets paired with Callie. A 12-week pregnant girl dies in the O.R. and her parents try to keep the baby alive. This causes tension between Derek and Addison. One doctor's overreaction unites two bickering patients. Finn is still treating Doc for medical problems.

The staff attends to an intern from another hospital who has short-term memory loss. This intern, named Marshall, also has caused a car accident that involved a married couple, their unborn baby and the woman's parents who the staff are also treating. The pregnant woman is named Melanie and she will die but her baby may survive. One of the female interns meets up with a woman from her past who is planning on having a family of her own. Cristina is in a good mood although Alex, Izzie, George, and Meredith are having problems but in the meantime Burke hasn't forgiven Cristina for her late night faux pas. Meredith and Izzie are making fun of Callie's household habits and George and Callie are having a fight because of George's roommates. Addison is continuing to own Alex and he's upset about it. Denny has an outburst at Izzie and Derek has an outburst at Meredith.

Addison's patient is a Catholic mother of seven. Addison gets in trouble after learning that the patient's husband won't use contraceptives. Derek treats a divorce attorney who asks if Derek is in need of her services. While Izzie and George are talking about their personal lives they "overhear" part of Derek's conversation with the divorce attorney who calls herself one of Seattle's best. Alex gets in trouble with Addison yet again for not being able to keep his mouth shut when other people think he should. A legendary jazz musician refuses to see medical reason. The musician is Burke's musical hero. Finn makes Meredith breakfast.

Meredith and Izzie take up knitting. Derek operates on Andrew, a spelling bee champ with a serious head injury. Bailey gets in on Andrew's surgery because she's worried that her coworkers won't recognize her Nazi-status now that she's a mother. Addison's patient has an unborn baby with medical issues. After Alex fails to bite his tongue when a terminal patient routinely lies to her daughter about her health he gets a lesson in bedside manners from Burke. George also begins to overstay his welcome at Burke's apartment after Callie visits him. Meredith has more confusing and uncomfortable encounters with members of her family. One of the female doctors meets a veterinarian named Finn. Izzie flirts with Denny and they play more naughty-Scrabble. Meredith, Derek, and Addison sarcastically take another small stab at their friendships.

After a series of deaths at the hospital some of the staff become very superstitious. Izzie worries about Denny and gets confronted by Alex. A patient with OCD drives Cristina crazy. Derek and Addison discuss their relationships with Meredith. Richard treats a friend from 17 years ago who reveals a secret about a dark time in his past that involves Ellis. George gets an earful about the women he's not talking to. Burke and Cristina argue about kicking George out.

The doctors are up to their necks in their usual levels of drama. Meredith is dealing with the backlash of sleeping with George, George and Burke are bonding in ways that bother and creep out Cristina, Cristina gets stuck on diaper duty, Bailey gets involved in a case even though she's still supposed to be on maternity leave, Addison and Derek have a talk, and Izzie is still flaking on Alex for Denny Duquette, the heart patient who didn't get a heart. In the patients-of-the-week department we've got a very pregnant woman, a hockey player who desires medically unnessasary amputation, and a woman with a fork in her neck who happens to be dying and has a struggling marriage.

Meredith and George are experiencing morning-after tension at home and at work and it has the rest of the doctors wondering what's up. Derek and Addison are experiencing their own version of morning-after tension as a result of Mark's visit to Seattle. Bailey, returning the favor that was done for her during the Code Black situation, must treat Addison for a specific feminine problem. Izzie and Alex are making headway in their relationship until Denny Duquette comes back. Soon Alex is not-so-oddly jealous of the attention Izzie is showing to Denny. Someone finds comfort in confiding in a patient who is going through an ordeal of his own. Burke deals with a patient and gets to observe the patient's unstable relationship with his fianc�e.

Derek and Addison's relationship is rocked to the core when a former friend comes to Seattle Grace and his presence promises to shake things up for a few members of the staff. Burke and Cristina's relationship is affected when one of her secrets is outted. Alex and Izzie are having similar reactions to their closet scenes during the Code Black crisis. On top of this a cocky doctor shows up to piss Derek off in all kinds of ways. A patient is suffering from constant orgasms and her condition sparks interesting conversations among the staff. George is trying to figure out how to get Meredith to see him as more than just a housemate. Another patient, that Derek is treating, is dealing with a rare disorder and needs his parents support and understanding. Burke has a patient who inspires him to talk to Meredith and Cristina about doing what they say they will. Meanwhile, Meredith learns more about her family (in fact maybe more than she may have wanted to know) through her parents.

Derek is still operating when he finds out about Meredith's current situation. Meredith is freaking out about her situation. Webber and Bailey are dealing with medical health issues. Cristina and Izzie have their own issues to deal with because of Meredith's situation. Addison freaks out when George tries to find a solution to Bailey's impromtu postponement. Overall, Seattle Grace Hospital is still under code black and the situation is getting worse.

An explosive case arrives at the O.R. that might endanger all the lives of the people working there, which leads Dr. Burke to declare a "Code Black" for the hospital. Bailey worries where her husband is as she is in labor. Also Izzie and Alex may be creating some heat.

All the nurses at Seattle Grace Hospital go on strike, leaving the doctors to fend for themselves. George refuses to cross the picket line and finally joins the nurses on their strike while Alex, Cristina, Izzie and Meredith meets Bailey's stand-in: Dr. Cindy Aaron, the complete opposite of Miranda Bailey. Izzie agrees to work on a difficult pregnancy case with Addison, while Cristina and Alex are in the pit attending to a young married woman with a real bad case of rash. Meredith happens on an old woman that she needs to intubate and then learns she was DNR.

Meredith and Cristina lie to each other and themselves about their relationships with McDreamy and Burke, respectively. George is given a hard task to expel a discharged and defiant woman from the hospital. Alex learns his fate after re-taking his medical exams. At the same time Izzie is trying to stop Alex from making stupid decisions when a patient that doesn't speak English is lied to by her coach. George, Cristina, and Alex compete in a hot dog eating competition.

Cristina is bothered by a new year's mandatory work limit. Izzie patient, Denny Duquette, wants two things: 1. a heart transplant, 2. Izzie. Addison detests Derek's trailer, Derek visits Meredith's mom, George treats a young teen hermaphrodite frustrated by her pre-pubescence. Other news includes patients doing uncanny things and relationship havoc being wrecked between the doctors, as per usual.

The holiday season has started but not everyone is in a festive mood. This is Alex's last day in the hospital unless he passes his boards practical exam the next day, thus everyone helps him to review so that he succeeds. However, Izzie is not happy about the others helping him and Meredith has to remind her of the true spirit of the Christmas holiday. Justin is in need of a new heart. One is available but he does not want it because he does not believe Santa gave it to him as his mother said. Cristina and Burke, both handling Justin's case, have opposing views on the matter due to their different stances on religion. Despite a reconciliation with his wife, Derek isn't in a festive mood. George has a simple case of a woman who has a bleeding ulcer, he realizes that the ulcer is caused by her entourage but fails to keep them away, with the consequence that it perforates.

Cristina Yang has little sympathy for Constance Ferguson (special guest star Rosanna Arquette), a prison inmate who jeopardizes her health just to get out of solitary confinement. Meanwhile the interns all keep careful watch on the family of premature quintuplets with a variety of serious health challenges, Izzie's anger at Alex reaches boiling point, and Dr. Addison Shepherd decides to teach Izzie a very painful lesson.

Dorie Russell is waiting for quintuplets, all 5 girls. Her husband seems more concerned than she is but she is set to bring her babies to their term of 36 weeks. All the departments are on call for the quintuplets as three of them have developped problems of different kinds. Meredith last night's stand shows up at the hospital with priapism and they need to call Derek Sheperd for a consult which puts Meredith in a very embarassing position. Alex and Derek must take care of a patient who has a tumor inducing thirst as a side effect. On the love side, Alex and Izzie are having some slight sexual problems, while Meredith goes on adding one night stands and Cristina is thrown off course by being "keyed."

It's Thanksgiving at Seattle Grace Hospital but the holiday's festivites are less than in order. Meredith and Derek try to counsel a family after their relative has had a seriously traumatic accident.

Meredith tries to avoid the Shepherds. Cristina and Burke go out on a date and end up getting caught up in their jobs. Derek asks Meredith not to ignore him until Addison comes walking around the corner.

Cristina, Izzie and Meredith take care of Shane, a man who appears to be crazy and claims that he is pregnant. Shane's case induces a spreading fascination among the staff. George relates to a patient's husband.

Train Wreck victims come to Seattle Grace and all staff gets called in. Everyone deals with really weird cases. Except Addison and Izzie. They work with a woman who is pregnant.

Cristina goes right back to working right after being discharged. Izzie isn't talking to Alex. Derek and Meredith treat a patient. George and Alex get stuck in an elevator.

As Cristina tries to recover, she proves to be a very difficult patient, and a visit from her mother doesn�t improve her demeanor any. And Meredith�s mother, Dr. Ellis Grey, has the hospital staff running in circles.

Cristina and Meredith try to figure out if Cristina should tell Burke that she's pregnant right before Cristina faces an emergency. Alex and Izzie get closer while Meredith's mother gets too close.

There's tension between Meredith and Addison. We find out why Derek and Addison aren't together. Bailey puts George on an impossible case. The rest of the interns operate on a family that was just in a car accident.

Picks up where the last episode left off. Meredith attempts to work with Addison Shepard. George is pimped out to relay the hospital gossip back to Webber. Meredith and Cristina relate at Emerald City Bar about what dating their respective attendings is like. Cristina ponders her relationship with Burke while trying to make a decision. Meredith is devastated by the latest blow to her love life. Meanwhile, Joe the bartender collapses.

A sexually transmitted disease breaks out and affects several members of the hospital staff. Chief Webber promptly calls a meeting. Meanwhile, the chief reluctantly tells Dr. Derek Shepherd about his own medical concerns. Izzie and Cristina worry about a patient's wife and daughter who can't agree on his care. Burke treats his college buddy Bill, whose medical diagnosis raises some questions regarding his wife's actions. Then just as Meredith and Derek grow more intimate, a surprise is revealed.

Meredith grows increasingly dissatisfied with the unknown details of Derek's life. Meanwhile, Alex treats Devo, a patient whose religious beliefs jeopardize her chances for recovery; Izzie contemplates reconnecting with her estranged mother; Zoey, a pregnant woman in her 40s who's been diagnosed with cancer, disagrees with Cristina's medical advice; and the interns are mystified by Cable, a patient who's being treated for seizures and who thinks he's psychic.

Derek and Meredith try (unsuccessfully) to be discreet as they spend the night together at Meredith's house, but their haggard appearance speaks volumes to everyone - including Bailey, who warns Meredith to end the relationship. Meanwhile George suspects an anesthesiologist of drinking on the job but is reluctant to speak up about it, Alex treats a former competitor who now finds honor in self-mutilation, Izzie has to deal with a patient who won't let go of his girlfriend - literally, and Cristina seems to be battling a case of the flu.

Izzie tries to get George to find the courage to ask Meredith out. All of the interns are in awe when a woman comes in with a record breaking tumor, but it is so far advanced that the woman's prognosis is not good. Now that Bailey knows about Meredith and Derek's affair, their jobs are in jeopardy, and she advises Meredith to end it. Meanwhile, Cristina and Burke's secret relationship is also getting more complicated...

Meredith realizes that she must take on a lot more responsibility when she is told that her mother needs to sign over all of her assets to her. As Izzie prepares to have a party for her boyfriend Hank (the scale of which is unknown to Meredith), Meredith has her first heart surgery. During the surgery she fears that she has fallen asleep and damaged the patient's heart. Meanwhile, Cristina and Burke hit it off. At the party, Meredith and Derek get caught together by Dr. Bailey.

While George is feeling a little less masculine because of the way Izzie and Meredith have been treating him (like a sister), Izzie is assigned to a patient about to lose all of his masculinity. Cristina, true to her competitive spirit, shows up early and assigns herself to an ill woman, who happens to have been Meredith's mom's scrub nurse. Alex, meanwhile, is busying himself copying and pasting pictures of Izzie's racy magazine spread all over the interns' locker room. And while Meredith is trying to cope with her mother's Alzheimer's, Derek treats a patient who has managed to get nails stuck in his head.

A bike race injures several pedestrians as well as well as participants. One pedestrian is left brain dead. Christina and Issie wish to use his organs for organ donation but with Christina's detachment and Issie's ever hopeful attitude that the man will recover, they will find the organ harvesting process an emotional one. Preston faces feelings of his dislike of organ harvesting - as a surgeon, he likes saving lives; harvesting organs doesn't save the person's life. George deals with Mac, a friend of the chief, who won't stop flirting with him. He is in need of a new liver. Meredith is fed up with Alex showing off as she continues trying to push Derek away. She also is reaching the limits of Issie's sunshine and George's politeness as she goes on living with them. Then there is their desire to see Meredith's mother's medical tapes. Getting through the day, Meredith realizes the keys to winning the race.

The surgical staff tries to be optimistic as a young woman clings to life after a brutal attack. Meanwhile Meredith puts her career on the line to save a newborn in the hospital nursery, and the other interns learn that it takes more than just medical knowledge to be good at their jobs.

Meet Meredith Grey. Daughter of famous surgeon Ellis Grey and currently recovering from a one-night stand. She shoos away her evening's companion, saying she'll be late for her first day of work. She is a first year intern at Seattle Grace Hospital and is working alongside some colorful characters. Cristina Yang is a highly competitive Stanford graduate who befriends Meredith. George O'Malley is a quirky warm hearted man who learns a lesson or two on his first day. Izzie Stevens is a former model who doesn't get any special treatment on her first day. And Alex Karev is an arrogant jerk who misdiagnoses a patient on his first shift. Overseeing them is Miranda Bailey, (not-so-) affectionately dubbed 'The Nazi'. Meredith also gets a surprise when she realizes that her friend from the night before is a co-worker, and even worse, her boss.