Grey's Anatomy

Meredith, shattered by revelations, is forced to work with Addison, Joe collapses at the bar, Cristina has some pretty shattering news of her own, and Alex starts working on Izzie.

After a fatal car accident, a man, a woman and their son are patients in the Seattle Grace hospital. The injuries of the mother reveal a family secret. Another patient has swallowed something strange, but refuses to reveal what. On the personnel level, Meredith and Cristina try to get along with the ending of their relationships. While Meredith tries to avoid Shepherd, Cristina and Burke are involved in the same medical cases. George feels uncomfortable still working with Olivia, who wants him to forgive her. Derek also reveals why he left New York.

Meredith's mother is admitted to the hospital, revealing that the once great surgeon now has Alzheimer's disease. Menwhile, Christina faints during operation and needs immediate care. She loses her baby due to complications and becomes a patient. Burke finally finds out about her pregnancy when it's too late. Mrs Grey gives hell to George because she thinks he is her husband, but George copes with it.

Christina becomes a patient and Meredith deals with her mother's illness.

A storm rages in Seattle. Izzie is very disappointed by her date with Alex, and Meredith is upset with Derek. They both complain to George, which drives him crazy. At the hospital, Cristina has a patient that uses porn as a pain killer and Meredith takes care of an Asian girl who needs to see a Shaman before surgery. There is a power shortage and George and Alex are stuck in an elevator with a critical patient. They need to perform heart surgery, but Alex is too freaked out and so George does it.

A train wreck brings multiple casualties to Seattle Grace, leaving Meredith hanging for her answer. Meanwhile, Alex finds working without his “mojo” a disheartening experience, and Yang searches high and low for a missing appendage.

Addison and Derek go to marriage counseling. Derek says that he's finished with Meredith. Meanwhile, Meredith becomes the main gossip topic in the hospital and Izzie and Christina discover a pregnant man. Preston tells the Chief about him and Christina and Alex finally kisses Izzie.

Friends of Derek and Addison come from New York for a preventative surgery that causes discord among both couples. George helps a man who falls from a roof. Bailey delivers news to the Chief.

Thanksgiving sends the occupants of the house in different directions: Meredith escapes to the hospital, George goes hunting with his family, and Izzie throws a dinner that it appears no one is coming to.

Meredith's one night stand causes complications when he shows up at the hospital with an embarrassing problem, Burke tries to push Cristina toward the next step, and Alex's problems affect his performance.

The mother of the quints blames herself, Izzy becomes attached to her patient, Karev must face the consequences of his actions, and Cristina cares for an inmate desperate to stay at the hospital.

Christmas brings a range of holiday spirits, from über-cheer to Scrooge, and holiday maladies.

Izzie realizes that she is attracted to her patient with a heart condition. George treats Bex, a hermaphrodite. Meredith's mother gets a special visitors. Derek and Addison's relationship is still rocky.

Meredith has to choose between her dog and her roommates, Alex gets his board results, and Bailey's pregnancy may be at risk.

The nurses strike, leaving the doctors unprepared for their extra duties. Cristina and Burke have to define their work relationship, Izzie relates to a pregnant teenager, and Meredith finds parallels to her mother in a case requiring her to remove life support.

The lives of everyone in the OR are threatened when a patient enters with a bomb inside of him… and a young paramedic with her arm inside the cavity is the only thing keeping it from going off.

While the man with the bomb lodged in his chest remains in Burke's OR, Bailey's injured husband remains in Derek's. Meanwhile, Bailey still hasn't delivered her baby.

Derek and Addison are shaken by the arrival of someone from their past. Meanwhile, Burke learns Cristina's secret, and Meredith delves into her family's dirty laundry.

Karma figures large in the minds of most of the staff for various reasons, and Meredith and George face the repercussions of their actions.

Cristina babysits for Bailey and doesn't take to it well at all. Meanwhile, Addison and Derek come to terms with their relationship, and Denny keeps coming between Alex and Izzie.

A complication from the LVAD surgery puts Denny in the OR during a death cycle, Cristina maneuvers to get George kicked out, and an old mentor of the Chief's is admitted for treatment.

George begins to overstay his welcome at Burke and Cristina's apartment. Cristina takes a seminar and discovers that Chief Webber is taking it too. Meanwhile, Meredith learns a startling secret about her father, Bailey worries her colleagues will not treat her the same now that she's a mother, and Alex gets a lesson in bedside manners.

While Izzie grills George about the personal details of his life, Addison takes Alex to task about a sensitive case. Also, Burke feels the pressure when he treats his musical hero, and Meredith considers dating a hunky vet.

The interns care for a family involved in a car accident. Derek lets his emotions get the better of him.

Burke and Izzie continue to search for a new heart. The residents treat victims of a workplace shooting.

The struggle to get Denny a heart continues. Christina gets to run her own trauma. Shepherd is responsible for a friend's life. The Chief's niece is brought to the ER by his wife.

Richard is determined to discover the guilty party, and punishes the interns by making them arrange a prom for his niece. Meanwhile, Callie presses George about his feelings, and Derek and Meredith have to make a decision about Doc.

When Izzie has a mental collapse after Denny's death, Izzie and Cristina turn to Meredith to try and make it better for her. Callie tries to cope with George not returning the three word sentiment she said to him. Meanwhile, back at the hospital, Alex and Addison deal with a baby left in a garbage can at a local high school, Richard receives an ultimatum from his wife, and Derek and George are quarantined in the locker room due to a patient suspected of having the plague.

Patients include a teenage boy with a tree run through him, a man with a tumor on his brain that forces him to be honest, and a patient who goes all out on living before her surgery as the interns begin to go all out on Bailey to ask Izzie to come back to Seattle Grace; Dr. Burke's mother goes all out on breaking Cristina's will; Addison goes all out with the bottle because she found some interesting pocket fanfare in her husband's tuxedo after the prom; and Callie goes all out to make George jealous.

Cristina refuses to quit, like she thinks Preston has. Finn and Derek refuse to quit on Meredith, who insist that they date her. Izzie won't quit standing out front of Seattle Grace, waiting for the time she feels is right to see Dr. Webber. Mark won't quit on giving up on Addison, who now realizes her marriage to Derek is over. And Alex wishes she would quit picking him as her intern in the OB-GYN department.

Denny's father (<a href=“/name/nm0911542/”>Fred Ward</a>) visits Izzie and gives her something that will change everything. Meanwhile, Meredith is diagnosed with appendicitis and while waiting for emergency surgery and high on morphine has a talk with Addison for the first time since Addison found the panties. Mark “McSteamy” Sloan starts working at the hospital and Alex wants to work under him instead of Addison because Mark has a patient with severe facial burns. And while Callie and George break up, Meredith finally picks one man.

Guilt causes different actions in everyone, the interns are allowed to attend an M&M meeting, and Derek and Addison finalize things.

Derek's sister comes to Seattle for a visit, and seems more into the extended family and gossip surrounding his divorce from Addison than into him. Meanwhile, the interns are not the only ones jealous of Cristina's opportunity to scrub in with Preston on a “Humpty Dumpty” procedure, and Bailey takes it personally when she learns she's been scrubbed, herself. George works with Addison on a very unusual case and Alex envies him.

Derek was looking forward to getting away from it all for a few days until his co-workers all go along on a camping trip. Bailey confronts Cristina and another doctor confronts Izzie about her feelings surrounding Denny. Addison and Callie are confronted by a major problem with a pregnant patient.

George must deal with his family when his father is admitted, Richard comes to a decision about his marriage, and Burke's secret is closer to getting out.

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

Miranda is adamant that Burke and Cristina be punished, Derek doubts his abilities, Izzie takes a stand, and Meredith deals with family in two very different ways.

As Mr. O'Malley's surgery approaches, he begins to suspect how serious his condition is, Izzie has to take a positive step to scrub in on a surgery, and Meredith keeps running in to her father.

George's dad has a rocky road to recovery, Cristina and Burke continue their war of silence, and Meredith reaches out to her father.

George deals with his grief, Cristina and Burke's silence makes for an interesting dinner party, and the Chief makes a decision that sends all the attending doctors scrambling.

A toxic cancer patient immobilizes the hospital, George has an announcement, and Izzie frets that her money wasn't well spent. Meredith, meanwhile, has new issues with her mother and Cristina worries that having a personal life could affect her career.

The interns face a mass-casualty incident while George crosses the professional line with Callie, Cristina asks Preston to let her tell Meredith about their engagement before anyone else finds out, and the Chief dons a new hair style.

Cristina keeps an eye out around the hospital for Meredith to tell her about her impending nuptials. Izzie fights for the life of her patient, still trapped between two vehicles on the ferry and Derek also searches for Meredith, wondering where she's disappeared to. Alex gets the job of notifying friends and family members about the status of loved ones.

Meredith interacts with some memories, all while the Chief, Burke and Bailey devise an unusual resuscitation maneuver. Meanwhile, Cristina has her own therapy and Derek speaks his mind to Ellis.

A Korean war veteran with an old bullet left in his shoulder is admitted into Seattle Grace. Tensions escalate between Izzie and George, and Callie must reveal a big secret. Alex continues to work with Jane Doe.

Izzie seems to be the only one with a memory of the previous night, Derek gets over-protective when Meredith gets a surgery, and one of Callie's relatives comes to town.

Meredith deals with an overbearing step-mother. Christina finds herself caught between Burke and Marlow. Derek fights for the job of Chief. Alex continues the search for Jane Doe's identity. And Izzie's past comes looking for her.

The Chairman of Seattle Grace's board of directors is admitted and all the attendings vie for his favor, Izzy and George keep getting confronted by the results of infidelity, and Preston presses Cristina for a decision.

Addison leaves for warmer climes and to figure things out, Susan visits the clinic, and Cristina's perfect wedding is changed when her and Burke's mothers hit town.

Addison is pulled into the case of a high-risk surrogate mother, Susan develops a complication, Izzy struggles with George's decision, and Ava has surgery that may restore her memory.

The interns take the biggest test of their careers, their first-year medical exams, as the residents attend to three injured mountain climbers. Meanwhile Callie's suspicions of George and Izzie grow, and Cristina struggles to write her wedding vows.

The interns, now residents, deal with their own crops of interns. Callie struggles with her new position, and Burke makes a decision.

Lexie persists in trying to get to know Meredith, and Mama Burke descends once more.

Callie hides in her office, frustrating Bailey who's itching to teach someone. Elsewhere, age becomes the theme as Izzie tries to convince ‘Really Old Guy’ he shouldn't die, Webber and Sloan set out to prove they're not too old to learn a new technique, and Karev is saddled with an intern who's past his prime.

Meredith and her intern lose a patient after they give her the wrong diagnosis, Callie confronts Izzie, and McDreamy bonds with the other Grey.

Meredith feels she's being haunted by her Mother's ashes, and Cristina is denied a surgery for a surprising reason.

A man survives a parachute accident without serious injury, two women refuse treatment because of a wedding contest, and Cristina and Izzie jockey for inclusion in Hahn's surgeries.

Hahn bans Cristina from her service, Bailey covers more and more of Torres' duties, and Izzie and George go to extreme lengths to recapture the magic of their first encounter.

Bailey crosses the line when the guy she had a crush on in high school shows up in the ER during an onslaught of high school students involved in a bus crash. The Grey sisters run and hide when their father shows up drunk, while Derek tries to get back into the dating scene with another doctor and Cristina tries her best to get back into Hahn's good graces.

An accident in the ER bay leaves two paramedics fighting for their lives, and a third who refuses Bailey's care. Meanwhile, Alex juggles two women, and Lexie begins to bond with a patient.

Tragedy abounds for everyone at Seattle Grace as they all continue in efforts to get the paramedic out of the overturned ambulance, stop the bleeding of a man who won't quit, and a bigot with a Nazi tattoo on his stomach. On the personal side, Rebecca returns to spend time with Alex, Miranda's husband finds it harder to wait for her while she's in surgery, and Cristina still tries to get on Hahn's good side, even though Bailey has put her elsewhere.

Bailey's son comes to the ER, Derek takes a housing step that puts pressure on Meredith, Izzie has a crisis of faith, and Cristina's choice may change her course with Hahn.

The judgment of the residents is skewed by a competition, Meredith tries therapy and a bear attack may be more than it appears.

Addison is not prepared for all the changes that greet her upon her return to Seattle Grace for a specialized surgery, Meredith and Derek begin their clinical trial, Izzie feels left out, and Karev is confronted with an unexpected announcement.

The new clinical trial patient has a secret, Yang is dealt a blow from a distance by Burke, the nurses refuse to work with Sloan, and Meredith's therapist tells her some home truths.

Cristina is still in her slump and turning mean, Izzie finally confronts Ava/Rebecca, and Meredith's anger with her therapist is challenged by a patient with a Cinderella story.

Meredith and Derek find that “happily ever after” isn't as easy as they hoped, Cristina finds interest in a military doctor, and the Chief is surprised to hear that Seattle Grace is no longer ranked as a top-tier teaching hospital.

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.

Determined to reverse Seattle Grace's slide into mediocrity, the chief lays down some new rules for interns and residents with which no one's happy. Derek asks Meredith for further changes in her living arrangements. Lexie challenges Cristina's diagnosis for a patient with a persistent headache, and the chief's preoccupation with reputation blinds him to problems with the physical plant.

Calllie worries over her first real date with Erica. Cristina stumbles upon a neglected area of the hospital.

Bailey's dream of a domino surgery is scuppered when one of the donors learns of her husband's affair, and Meredith is insulted when she gets no credit for the procedure she and Derek worked on together.

The new trauma surgeon shocks everyone with his methods, Bailey is asked to save a girl with an inoperable tumor, and Callie's not sure what she wants.

The residents and interns squabbling over procedures upsets Dr. Hunt, Erica discovers what happened to the heart she lost, and Derek asks Sloan to break out the McSteamy to distract Yang.

Izzie wrestles with her ghost, Torres uses a ground-breaking procedure to get her mind off of Hahn, and the interns continue teaching themselves spurred on by a new cohort.

Sadie manipulates the interns into performing a procedure that goes horribly wrong, Izzie's ghost refuses to leave, and Mark bonds with a girl who's taken responsibility for her sleep-walking father.

The residents make their cases for the solo surgery, Sadie chafes at her restrictions, and Sloan battles his desires.

Derek has trouble with objectivity concerning his death row patient, Cristina and Meredith continue their feud, Izzie confides her problem to Alex, and the Chief faces what's become of his life's work.

Derek's mother visits, the death row patient starts angling for death in the hospital, Izzie craves more in her relationships, and Jackson's need for organs becomes critical.

Meredith and Miranda each cross a line, William Dunn regrets his decision and Izzie finally confronts what Denny's appearance means.

Cristina carries on an intense flirtation with Owen, Derek gets advice from everyone on how to propose, Izzie gets some tests done, and Bailey's promotion may stand in the way of a new career possibility.

Owen runs into someone very special from his past. Izzie employs her fellow doctors in a medical game made to help teach the interns. Naomi, Sam and Addison rush Archer to Seattle Grace and meet with Derek and Mark to save his life.

Addison and Derek differ on the treatment plan for their patient, Cristina discovers malpractice in high places, Izzie gets bad news, and Mark spectacularly mistimes his confession.

Derek's malpractice deposition reveals an unhappy statistic, the interns finally diagnose ‘Patient X’, Karev stands up to two attendings to save a band geek, and when Webber shuts Miranda out completely she makes a call.

Sloane's facial transplant fades to the background as the interns begin squabbling, Bailey's attempts to reach Derek unexpectedly clear surgeons from the hospital, and Cristina juggles her first solo surgery with treating a resistant Izzie.

Owen's PTSD endangers Cristina, Izzie's illness leaves the residents dealing with guilt and anger - to her expense, and Derek's fear causes him to persevere for Meredith's answer.

Izzie bites off more than she can chew on her first day of chemotherapy, Mark and Derek are forced to work on the same patient, Meredith's plans for a simple wedding take a turn, and Karev finds himself split between worry over Izzie and excelling as a resident.

Izzie's mother comes to town, a little girl shoots her father, triggering a conflict between Meredith and the chief, Thatcher reappears, and Callie gets her first taste of life without her trust fund.

A car crash involving students going to their college graduation takes its toll on the residents in the ER, Derek's wedding gift is uniquely suited for Meredith - even if the oversight is not. Meanwhile, Denny's return has Derek and Bailey searching for the cause, and the results will change the outcome of the day.

Izzie is torn over whether to have Derek's proposed brain surgery. A soldier on medical leave asks for a radical operation so he can return to active duty. The Chief tries to lure Bailey back to general surgery with a new toy, and Mark shifts into high gear with major life changes.

Covering days one through 13, everyone at Seattle Grace fights to save Izzie and George's lives and then deals with the aftermath. Elsewhere, Hunt treats a double amputation, and Arizona has a teen with painful growth spurts.

As hospital personnel jockey for notice to keep from being fired, Izzie returns to surgery early and Bailey's triple aneurysm patient refuses her procedure because of her schizophrenic son.

Thatcher is hospitalized with liver failure, and Meredith fights anger and guilt while deciding her responsibility. Sloan treats an octogenarian who wants an implant. Izzie's interference in Hunt's cancer case may have deadly consequences.

As Mercy West merges with Seattle Grace, battle lines are drawn between the two hospital's residents over the patients.

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 residents defend their actions in an effort to save their jobs.

When Isaac, the hospital lab tech, has an inoperable tumor wrapped around his spine, he turns to Dr. Derek Shepherd to do the impossible, and Derek tests the Chief's authority when Richard objects to moving forward with the risky surgery.

A generous donation is offered to Seattle Grace by the parents of Arizona's 10-year-old patient. however, when his condition worsens, she finds herself in a conflict of interests. Meanwhile, Cristina tests her boundaries with Owen at the hospital, and adding insult to injury, Alex is left with all of Izzie's hospital bills to contend with.

When Owen recruits his fellow Iraqi War vet, Dr. Teddy Altman, as the new cardiothoracic surgeon, Cristina questions Teddy's abilities in the OR and the nature of their past relationship. Meanwhile Izzie returns to Seattle Grace with her high school mentor seeking treatment for his dementia, and the stress of Richard's responsibilities, post-merger, are taking their toll.

As Thanksgiving, Christmas and New Year's pass, Miranda is visited by her father, William, who disapproves of her choices in life; meanwhile, Mark and Lexie must cope with the shocking arrival of a woman from his past, and Thatcher Grey questions the Chief's recent behavior as Meredith comes to his defense.

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.

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.

An intra-operative crisis casts a shadow over Derek's first day as interim chief, Owen's influence worries Cristina, Karev's first pediatric surgery case turns out to be more than babysitting and Webber resents the decision he must make.

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.

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.

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 HIV.

When Avery's grandfather comes to the ER, Webber's wish for a stress-free first day back is lost after the surgeon requests an awake surgery. Elsewhere, Cristina and Teddy attempt a hand-me-down lung transplant for a cancer survivor.

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 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.

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.

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.

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. 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.

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 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.

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

The staff tries to deal with physical and emotional trauma in the wake of the deadly rampage.

After weeks of concealing the fact she was pregnant and miscarried, Meredith at last tells Derek and is finally cleared to return to her surgical duties in the wake of the hospital shooting spree; Cristina experiences post-traumatic stress disorder in the midst of an operation; and Bailey refuses to let Alex operate until he agrees to have the bullet in his chest removed.

When Derek receives an unexpected and unwelcome visit from his estranged sister, Amelia, issues between the siblings – both past and present – come to the surface; the Chief tries to help Alex when he notices that he's refusing to use the elevators after his near-fatal shooting; and Meredith and Derek continue their efforts to ease Cristina back into surgery after her post-traumatic stress.

Things are hostile on all fronts when a visit to the obstetrician results in some disturbing news for Meredith and Derek, and Lexie loses it when she notices Meredith and April getting closer. Meanwhile a car crash brings in multiple traumas and Jackson tries using his physical attributes to get ahead in the operating room, while Cristina's self-doubt carries outside of the hospital and into her house hunting with Owen.

As part of their training, the Chief puts Seattle Grace's residents – including Meredith, Cristina, April and Jackson – in charge; meanwhile, Derek, Callie, Owen and the other attending surgeons compete for a million-dollar grant.

A documentary film crew visits the hospital six months after the shooting to document the road to recovery for doctors and patients. The camera lenses follow Derek, Owen, Mark & Callie as they ambitiously perform a rare arm transplant surgery, Meredith helps Cristina put on a brave face for the cameras, and Bailey's patient, Mary, returns for her surgery – which marks the first time they've all seen of each other since that fateful day.

The residents are pushed to their limits when Owen puts them through a rigorous trauma certification drill; meanwhile, Cristina is also tested when left alone to monitor a very ill lung transplant patient.

Top security measures go into place as a team of doctors, led by the Chief, try to save the life of a major political figure from the Middle East. Meanwhile Cristina decides to finally decorate her new place and throw a housewarming party, and Alex shows up late from a weekend getaway to his first day of rounds with the new Pediatrics Attending, Dr. Phil Stark.

Derek lands the grant he needs for his clinical trial and all the attendings take him out to Joe's Bar to celebrate, but they get a surprise when they see someone they know already at the bar. Meanwhile, Meredith and Alex have to fend for themselves during the night shift with a nine-year-old patient who's experiencing post-surgical complications and his very pushy mother.

Despite Meredith's objections to the idea, a concerned Derek takes Cristina on a fishing trip in order to get away from it all, while Teddy, feeling directionless without Cristina, directs all of her efforts and compassion towards a dying patient who lacks the proper insurance to seek medical treatment.

News of the incoming mass causalities after a gunman opens fire at a local college hits the staff hard when they must spring into action, even while their own wounds are still fresh; and Arizona does not receive a warm welcome home at the hospital.

Arizona seeks Mark's advice as she tries to reconcile with Callie, who has big news of her own; Teddy must make a key decision for Henry during his surgery; and on the same day the residents receive a new crop of interns, the Chief announces he is looking for a new Chief Resident.

Derek begins the long series of trial surgeries and Meredith is offended that she wasn't asked to work on the study. Cristina is back stronger than ever but must fight an eager Jackson for a surgery with Teddy.

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.

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.

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.

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.

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.

In a series first, the music that has been at the heart of the show and been beloved by fans comes to life for Grey's Anatomy: The Music Event. A cataclysmic event rattles the doctors of Seattle Grace to the core, as Callie, on the verge of an enormous life-changing moment with Arizona, envisions her hospital and friends as it has never-been-seen before. “Chasing Cars” (Snow Patrol), “How to Save a Life” (The Fray) and “The Story” (Brandi Carlile) are among the songs performed by the cast.

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.

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.

As the official Chief Resident interviews begin, everyone steps up their game in the hopes of impressing Owen. Meanwhile, Meredith anxiously prepares for her first interview with the social worker and Christina fights for a shot in the operating room.

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 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 Chief makes a career-changing decision that shocks Seattle Grace Hospital; Cristina and Owen try to find normalcy in their relationship; April continues to struggle in her new role; and the 5th year residents are given their first solo surgeries, only to find out that even the most routine procedures aren't always easy.

The doctors of Seattle Grace are called upon to man up when a stampede at a comic book convention causes an influx of colorful characters in the OR - blurring the lines of fantasy and reality; Mark shows his softer side with baby Sofia when Arizona and Callie go out of town, but at work he continues to give Jackson a hard time; Ben returns to the OR, only to find that Nurse Eli has moved in on Bailey; and the male doctors bond over their frustrations with women.

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.

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.

While Chief Hunt attempts to build team-working skills amongst the doctors of Seattle Grace Mercy West in preparation for their big game against Seattle Presbyterian, Alex investigates into the legal proceedings around Zola's adoption. Derek prepares for a surgery never before preformed and Teddy has a seemingly unusual plan for Cristina's future in surgery.

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.

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.

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.

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.

While Derek prepares to operate on a tumor deemed entirely inoperable, Hunt pressures Meredith to declare a specialty. As Cristina and Teddy try to steal a prized cardio surgery, the doctors celebrate Richard's 10,000th surgery.

What if Meredith had had a happy childhood? What if Ellis Grey had never gotten sick? What if Derek and Addison had stayed together? Then what would have happened? We see the very different lives of the doctors of Seattle Grace in an alternative world and wonder who controls our destiny? Are certain things meant to be?

On Valentine's Day, Lexie volunteers to watch Zola for Meredith and Derek; Callie plans an evening for Arizona; and Ben shows Bailey how much he cares. Meanwhile, Christina and Owen drift farther apart, despite the fact that he saves her when a car crashes into the hospital. Meredith and Bailey treat a woman who has headaches and seizures. Webber and Lexi treat a man who was hit by a car during a fight with his girlfriend. And Alex treats a 10-year-old girl who has a severe reaction to peanuts when her boyfriend gives her a Valentine's Day gift.

In a final attempt to save Erica's life, Amelia arrives at Seattle Grace to beg Derek for help with the gliosarcoma case; Cristina and Owen engage in heated arguments during marriage counseling; Alex realizes that in order to be a good doctor, he'll need to improve his people skills; and Meredith is given a chance to shine when a man enters the ER after getting his hand stuck in meat grinder. Meanwhile, the residents continue to study for their upcoming oral boards.

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.

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.

A pet lion on the loose gives the hospital some fierce injuries to deal with. Meanwhile, Cristina continues to ignore Owen, Lexie reconsiders her feelings for Mark, Callie has to face Arizona's romantic past with other hospital staff, and Alex starts to feel uncomfortable about his relationship with Morgan.

Grey, Bailey, and Webber work on a multi-organ transplant but run into some barriers when Dr. Sloan, the temporary Chief, orders them to cancel the surgery. Meanwhile, Cristina and Owen spend the day at home, working through their marital problems.

While the hospital becomes the center of attention as the victim of a famous kidnapping case is brought to the hospital, the fifth years take their placement interviews. Meanwhile, Adele Webber's memory continues to deteriorate, forcing Richard to reconsider their relationship.

As the fifth years head off to San Francisco to take the most important exam of their lives, with some surprises along the way; Owen and Teddy continue to fight back at the hospital, Mark and Lexie reconnect, and Tommy's condition worsens even more.

Six hours after their oral boards, the fifth years relive their answers and worry about their chances. Back at the hospital, Bailey has to woo potential candidates for the hospital and Mark is startled when Julia makes a proposal about their future.

Before the Seattle Grace doctors head to Boise to take part in an operation on conjoined twins, the Attendings pressure the 5th years for final decisions on their posts next year. Meanwhile, Arizona must face the reality of her friend's condition and Ben tries to get Bailey to go on a special lunch date.

Months after the plane crash, the doctors at Seattle continue to try and find a new sense of normalcy. With a new set of interns to put through the ringer, the new fellows and attendings get used to their roles while Cristina adjusts to her new life in Minnesota. But the life of one doctor hangs in the balance and it's clear that Seattle Grace Mercy West is not the same.

Each of the doctors involved in the crash experiences flashbacks that take them back to their time of rescue and explain how they got to where they are now.

The survivors of the crash are presented with a settlement offer, forcing them to choose between putting the incident behind them or investigating the true cause. Meanwhile, Jackson and April struggle to work with each other, Bailey is annoyed by the new attendings' behaviors, Callie struggles to communicate with Arizona, and Cristina learns to work with her new colleagues in Minnesota.

As Cristina begins to make new “friends” in Minnesota, Meredith struggles with whether or not to tell Derek about an extremely rare case she is working on. Meanwhile, Arizona begins work with her new prosthetist and tensions flare around work when Jackson's mother comes into town.

Split between Meredith in Seattle and Cristina in Minnesota, this episode shows each surgeon tackling an incredibly challenging surgery. Meredith must juggle work and parental obligations while Cristina is caught between Dr. Thomas and Dr. Parker.

Cristina's return to Seattle proves to be awkward when she and Owen must face each other again. Meanwhile, Jackson and April continue to try and negotiate their relationship, Jo deals with a perplexing case, and Bailey attempts to get Arizona into the hospital. Then, the survivors of the crash are shocked with new information about the cause of the crash.

It's Arizona's first day back at work and Callie tries to keep things as normal as possible for her. Meanwhile, Bailey argues with Ben over wedding plans and Cristina and Owen continue to struggle with their relationship while Owen faces his first set of meetings about the plane crash.

In an intern-centered episode, Jo and Alex work closely together and Jo discovers she has a certain image. Meanwhile, Meredith's intern is forced to find a donor nerve for Derek's hand and Cristina pits two of her interns against one another in competition for time in the OR.

As a jittery Bailey prepares for her wedding, Meredith and Derek disagree on whether or not to go through with the nerve transplant from Lizzie. Then, Cristina learns of the real reason behind Owen's plea for a divorce and Jo finds herself in trouble when she accuses Alex of mishandling her training. Then, a last minute emergency changes everything.

The survivors receive a final verdict about the plane crash which will change their lives, and the hospital, forever. Meanwhile, Derek continues to undergo rehabilitation on his hand, Cristina and Owen enjoy their new relationship with each other and Richard tried to avoid Catherine's advances.

Arizona is grappling with the pain of Phantom Limb when a consultant arrives at the hospital to begin investigations. While Derek embarks on his first major surgery, Meredith faces her biggest fear as she experiences pregnancy mood swings.

While Derek and April try and find a way to save the ER, Cristina and Leah struggle to keep a patient alive while respecting his wishes. Alana is pulled into a surgery with Owen that may change the way she views the hospital's ER.

Alex and Jackson are pitted against each other to become the next “face” of Seattle Grace while they work on a sex reassignment surgery for a trans-gender teen. Then, April brings in an emergency trauma case which requires the help and discretion of many of the doctors. Meanwhile, Callie and Richard visit a recently revitalized hospital to understand what they are all in for.

As the hospital inches closer to finding a buyer, many of the doctors don't like the new changes being made, causing the crash survivors to consider a crazy idea. Meanwhile, April's relationship with Matthew progresses and she asks Jackson for advice.

The crash survivors race against the clock to find a buyer for the hospital before Pegasus closes in. Meanwhile, the interns and other doctors at SGMW plan for what they believe will be their imminent departure while Jackson's mother continues to try to convince him to move to Boston.

The transition to new management has the doctors at each others throats. Matters become worse when Owen quits, leaving the OR board in complete disarray.

A couple of Syrian doctors arrive at Grey Sloan Memorial to learn field techniques for war zones. Then, when a series of patients return with post-op infections, one doctor's work falls under suspicion.

At Jackson's request, the CDC arrives at the hospital to begin an investigation surrounding Bailey's patients. April blames Jackson for her breakup with Matthew and Alex tries to be nice to Jason. Owen continues to get closer to Ethan as his dad's health remains uncertain.

A magician's assistant arrives at the hospital with a severe injury that has all the general surgeons involved, except for Bailey who is ignoring all of the attendings. As Cristina searches for a way to wake his father up, Ethan has a medical emergency of his own. Alex tries to avoid Jo at the hospital and a new cranial-facial specialist flirts with Arizona.

With a major storm rolling in, the hospital is chaotic. When Jason comes into the hospital in critical condition, Alex does everything he can to protect Jo. With Meredith's due date just weeks away, Derek urges her to slow down.

Callie makes a decision about her relationship; the doctors receive devastating news.

Meredith struggles to balance her roles as a surgeon and a mother.

Callie and Derek collaborate on a brain mapping project.

Costumed patients create a challenge for the doctors; Derek and Ben work on a new surgical technique; Richard asks a resident to perform his next surgery, angering Bailey.

A betrayal intensifies the issues between Cristina and Meredith; Matthew and April make a decision about their relationship; Bailey faces difficulties with Ben's return.

As Callie is faced with a malpractice suit, her supportive father (Hector Elizondo) visits and shares a secret; past details about Callie and Arizona's marriage are revealed.

Ben worries that an innocent conversation with Derek could end up causing problems for Bailey; Cristina turns to Shane as tension with Meredith increases; April's upcoming wedding creates an uncomfortable situation for Stephanie and Jackson.

April's visiting sisters get on her nerves; when Matthew and Jackson witness an accident, they must work together; Callie and Arizona work on their relationship.

Meredith and Cristina bicker about their careers; Bailey talks to Ben about him moving back to Seattle; Shane puts himself in a risky situation; Derek receives a life-changing phone call.

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.

Couples panic when the hospital announces a nonfraternization policy; Owen and Emma discuss the future; Meredith and Cristina have some girl time; Richard asks the residents for help with a rare cancer case.

Arizona's bad day escalates when she advises a patient on a potential double amputation; Derek breaks a promise; Stephanie and Jo find an abandoned baby; the nonfraternization rule leads to a suspension.

Arizona realizes that her leg can be repaired, but will she make the sacrifice to get it?

Follows Christina's life as she wonders how her life would take shape based on a single decision.

The doctors of Grey Sloan Memorial Hospital succumb to an infection that spreads like wildfire. Cristina deals with a complex case involving siblings and Alex begins to consider his future in the hospital.

Meredith and Bailey tackle jealousy as Cristina receives an early morning phone call that might change her life; Callie comes to a shocking realization and Alex makes a decision.

Callie and Arizona discuss having another baby, Derek has a hard time juggling work and family, Jackson and April have their first big fight and Christina attends the Harper Avery Award Ceremony. But is she going to win?

Derek's sister Amelia comes for a visit; Alex confronts Arizona and the rest of the hospital about his decision; Dr Webber finds out the truth about Harper Avery award from Catherine.

The doctors work together to operate on two sisters joined at the head; Cristina travels to Zurich where she deals with a blast from her past; Richard voices his concern over the hospital's allegiance with the Harper Avery Foundation.

While Bailey faces dire consequences for her reckless behavior, Cristina interviews candidates for Dr. Russel's replacement. Alex returns with a motive, disappointment hits Callie and Derek brings forth a shocking proposal to Meredith.

Grey's Anatomy season 11 premiere full episode “I Must Have Lost It On The Wind” and How to Get Away With Murder series premiere full episode “Pilot.”

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.

Owen introduces Callie to the Veterans Hospital patients in hopes that she will help them with her robotic limb lab, Jo becomes jealous of Alex and Meredith's friendship, and Maggie continues to confide in Richard. Meanwhile, Alex and Bailey prepare to go in front of the board.

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.

Callie and Arizona examine their marital problems and what's contributed to them. Meanwhile, Callie devotes herself to the veterans' project; Arizona strives to impress Dr. Herman; and Richard seeks guidance from Bailey.

A woman comes in badly hurt from a car jack and Owen pays some extra attention when she is found to have served in the military. Derek desperately tries to organize a dinner binding together Meredith's complicated family but is fought from every angle. Meanwhile April reacts strongly to the arrival of her mother and Arizona is fighting hard to manage under the pressure from her new “boss”.

Arizona has to take care of one of Herman's patients. Everybody finds out Amelia was a drug addict and Derek lets her down. Jo has her first solo surgery. Maggie is invited to Ellis' house and Arizona decides to move in with Alex.

Pierce and Grey disagree with Derek about the best way to approach a patient's case, which lead the couple to a very big argument. Meanwhile Callie feels responsible for one of her veterans when he is pushed too far and a doctor's routine procedure shows devastating results.

Meredith keeps herself busy while Derek prepares for his move; Jackson and April get difficult news; Arizona and Amelia talk about how best to approach Dr. Herman.

April stays positive as tests are run on her baby; Dr. Herman plans a crash course in fetal surgery; Callie and Owen encourage each other to return to the dating scene; Bailey, Meredith and Maggie try to learn more about a patient's tumor.

Meredith tries to find a sitter so she can go visit Derek, Amelia and Stephanie work together on a case.

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.

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.

The moment of truth has arrived. Amelia begins the daunting surgery to remove Dr. Herman's tumor. Meanwhile, Arizona takes the lead on a case that means a lot to Dr. Bailey.

An earthquake leaves Maggie trapped in an elevator and threatens Meredith's streak of successful surgeries; Owen gives medical advice over the phone; Ben opens up Jackson.

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.

Rattled by recent events, Meredith tries to decide what to do about Derek; Owen is stunned when his mother is admitted to the hospital.

A group of children visit the hospital on a field trip and observe two injured cops rushed into the emergency room. Meanwhile, Stephanie develops a crush on one of the chaperones; and Amelia's forced confront her feelings about Owen.

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 small plane crash results in multiple casualties, bringing back terrible memories.

Derek witnesses a terrible car crash and jumps in to save a life.

Jackson struggles to understand April's decision; Ben & Bailey discuss their future; a patient revisits Callie; Amelia tries to deal with her past.

The doctors must set their emotions aside and focus on a catastrophe.

The doctors from Grey Sloan Memorial Hospital spring into action to save the lives of two girls with a powerful story. Meanwhile, Meredith tries to cope with the fact that Amelia is now living with her and Jackson prepares for April's return back to Seattle.

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.

When Maggie gets an invitation to her ex-boyfriend's wedding, she starts to reevaluate her choices.

Owen suggests the interns learn about breaking bad news to patients' families.

Maggie leaves her dinner party and races to the hospital, so April takes over the cooking duties in an attempt to avoid Jackson. Meanwhile, Arizona is extremely anxious about meeting Callie's new girlfriend.

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.

A high-stakes case is tackled by a team of doctors, and the atmosphere grows tense. Meanwhile, Bailey pressures Ben to evict their roommate; and Arizona enthusiastically reenters the dating scene with a new wingman.

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.

Meredith is attacked by a patient, and Penny finds her injured. The staff of GreySloanMemorial is standing by Meredith trying to save her life.

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.

Flashbacks reveal the evolution of April and Jackson's relationship, beginning with their initial meeting, and the years-long process of one of Jackson's patients.

A patient from Meredith's first surgery as an intern is re-admitted to the hospital with an aneurysm; Maggie thinks Richard knows about her relationship with Andrew; Arizona considers dating again.

Meridith, Jo, Bailey, Callie and Jackson head to a Veterans hospital for an spectacular yet unusual surgery. Meanwhile, a group of snobby cheerleaders come into the ER and Warren makes a risky decision.

Richard swaps pairings among the residents and attendings, baffling everyone. Meanwhile, Arizona makes a bold decision as she treats a woman who's carrying quadruplets; April faces a tough choice.

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

Meredith takes a step forward with Will but quickly regrets it; Maggie senses a disconnection with Andrew; and Amelia reevaluates her relationship with Owen. Meanwhile, Catherine comes into town and really shakes things up with April and Jackson

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.

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.

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.

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

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.

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.

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.

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 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.

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.

Alex tries to do the right thing but still can't 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Doctors are at odds over how to treat Maggie's mom.

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.

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

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

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.

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.

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.

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.

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.

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.

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.

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!

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.

Jo finally faces her abusive husband, while Grey Sloan continues to work with the FBI after the hospital's computer system is compromised by a hacker.

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.

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

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.

Seattle firefighters Ben Warren and Andy Herrera head to Grey Sloan after rescuing two boys who were injured in a house fire; the doctors work on their projects for the surgical innovation contest; Amelia brings Tom Koracick in to consult.

Maggie's relationship with Clive starts to progress; 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 is a friend of the family.

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 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

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.

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

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.

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

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

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.