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Meredith and Cristina return from Cristina's honeymoon to find that Burke is long gone. Izzie, Alex, Meredith and Cristina start their first day as residents, each with their own set of interns. Among the interns are George, who is repeating his internship after failing the exam, and Lexie, Meredith's half-sister. Meanwhile, Derek begins to look elsewhere after his relationship with Meredith hits an emotional impasse; Bailey grapples with the fact that her former interns now report to Callie, the new Chief Resident; and Richard returns to his position as Chief of Surgery.

The interns and residents treat victims of an apartment complex explosion as Alex looks into the cause of the devastating accident. Mama Burke arrives at Seattle Grace to pick up the rest of Burke's personal things while Cristina trades wedding gifts for surgeries. Meanwhile, Lexie tries to talk to Meredith, who is less than willing to do so; Callie deals with the stress of being Chief Resident; and Bailey tries to figure out what to do with her excess leadership skills.

The new interns are in awe of fellow intern George's skill level, and Lexie tries to keep his repeater status secret. Meredith comes to Lexie's aide when Lexie is faced with her first emergency situation. The Chief and Sloan have to use a radical surgery to save a woman's vocal ability. Meanwhile, George debates telling Callie about his affair with Izzie.

Izzie reveals her true feelings for George to one of her and George's friends, and the reaction she receives is not what she expected. Meanwhile, Adele Webber rushes her niece to Seattle Grace; Derek gives Cristina pointers on how to be a better teaching resident; and Norman, the world's oldest intern, misdiagnoses Meredith's patient.

It's Halloween at Seattle Grace and the day is chock-full of surprises for the doctors. Alex has a surprise visit from a former patient; Meredith thinks her mother's ashes are haunting her; Cristina is snubbed by a top surgeon; and everyone is shocked when Callie reveals George and Izzie's relationship to the public.

With his marriage once again falling apart, Chief Webber invites the male surgeons out on a gentleman's evening. Meanwhile, Cristina and Izzie compete for the same surgeries, mainly to impress the doctor performing them; Meredith treats the survivor of a skydiving accident; and two finalists competing in a promotional competition are treated by the doctors.

George and Izzie's relationship is tested, as is Derek and Meredith's when Derek wants more than a physical relationship with her. Meanwhile, Mark falls for a surgeon and Callie's position as Chief Resident is put on the line when she gives too many duties to Bailey. Watch Greys Anatomy online at iwatchgreysanatomy.com.

The ER is thrown into a state of chaos following a school bus accident. Meanwhile, Bailey treats her high school crush; Derek goes on a date; and Thatcher comes to Seattle Grace in search of Meredith.

Meredith and the Chief rush to the scene of a devastating ambulance crash in which the lives of the paramedics are at stake. Bailey treats a difficult patient and Ava returns to find Alex with a new girlfriend.

In the conclusion to the two-part episode arc, Meredith races to save the life of a paramedic, who is trapped inside an ambulance. Meanwhile, the life of a patient is in Lexie's hands and Derek and a nurse work together to save the life of a patient.

George has a surprise visitor. Callie copes with not being an O'Malley anymore. Bailey's family is falling apart, by her husband not thinking she cares about her son and husband. Tuck goes into surgery with the whole hospital worried. Derek sorts through what kissing Rose means. Meredith discovers something that doesn't inspire hope or happiness in her. Alex treats a faith healer, and doesn't believe in her "powers".

Six weeks following Derek and Meredith's break-up, Derek continues to date Rose while Meredith, Alex, Izzie and Cristina compete in a surgical contest. Meanwhile, George and Lexie adjust to their new apartment and Callie finds a new friend in Erica Hahn. Watching Greys Anatomy online could not be any easier than iwatchgreysanatomy.com.

Addison makes her return to Seattle Grace in order to perform an operation. As she does so, she is preoccupied by all of the changes in her former co-workers' lives. Meanwhile, Meredith and Derek's clinical trial has its first patient, and Rebecca returns to deliver Alex some shocking news. Free Greys Anatomy episodes at iwatchgreysanatomy.com allows you to watch Greys Anatomy online for free.

The nurses' outcry over McSteamy's frequent trysts leads the hospital to enact a new date and tell policy. Meanwhile, news about Burke's career force Cristina to cope with her feelings about the past; Meredith and Derek take in a veteran soldier to participate in their clinical trial; and Callie finds comfort in Sloane when she needs it the most.

As Dr. Wyatt refuses to let Meredith give up on her therapy sessons, Alex learns the truth about Rebecca's condition. Chief Webber has Dr. Hahn perform a high-risk surgery on his mentor. Meanwhile, after hearing about Burke, Cristina continues to act unusually, going as far as to clean her ever-messy apartment. Watching Greys Anatomy online could not be any easier than iwatchgreysanatomy.com.

In the two-part season finale, Meredith and Derek take another shot at the clinical trial while the others race to free a boy from a hardening block of cement. Meanwhile, Izzie helps Alex care for Rebecca and Lexie learns a secret about George's intern status.

In the two-part season finale, Meredith and Derek take another shot at the clinical trial while the others race to free a boy from a hardening block of cement. Meanwhile, Izzie helps Alex care for Rebecca and Lexie learns a secret about George's intern status. Watch this episode on watch Greys Anatomy online for free.