Grey's Anatomy Season 4

Grey's Anatomy - The Complete Fourth Season
The fourth season of Grey's Anatomy premiered on September 27, 2007. This season focused on Meredith's relationships in her personal life with her sister, Derek and her mother.
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Season 4, Episode 1: A Change Is Gonna Come
Original Air Date—27 September 2007
Meredith, Izzie, Cristina, and Alex have become residents and are put in charge of the new interns at Seattle Grace. Meredith find out that her half sister Lexie is among the new interns. Callie struggles with her new role as chief resident, while Bailey is upset because the job was not given to her. Bailey's bad attitude causes problems between her and Callie.
Season 4, Episode 2: Love/Addiction
Original Air Date—4 October 2007
George tells Callie that their marriage is over. Derek and Meredith decide to just have sex, instead of being in a relationship. After a gas main break blew in their building, five patients are brought into the pit. Mama Burke shows up to the hospital. Callie will not allow a resident to oversee the clinic.
Season 4, Episode 3: Let the Truth Sting
Original Air Date—11 October 2007
A woman named Marcy bring in her son, due to suspicious behavior changes. Unless Mark and Richard can perform a new surgery, a patient named Connie may lose her ability to talk. George deals with his guilt about having sex with Izzie. Really Old Guy, a comatose patient from previous seasons, wakes up.
Season 4, Episode 4: The Heart of the Matter
Original Air Date—18 October 2007
The Chief's niece Camille is admitted to the hospital for more surgery. Callie forgives George for sleeping with Izzie. Izzie tells Alex about her affair with George. Derek professes his love for Meredith. Lexie thanks Cristina for saving her in surgery. A teen football player needs surgery for an injury he sustained while playing.
Season 4, Episode 5: Haunt You Every Day
Original Air Date—25 October 2007
Callie announces to everyone that Izzie is sleeping with her husband. Richard needs a new place to live, as Adele files for divorce. Bailey has a patient who claims that his foot that doesn't belong to him. Norman is in Alex's group of interns today and asks if he can go home because he is not feeling well.
Season 4, Episode 6: Kung Fu Fighting
Original Air Date—1 November 2007
Cristina and Izzie fight for a spot on Dr. Hahn's surgery team while two patients refuse treatment because they are competing in a wedding contest. Dr. Webber's marriage faces more dilemmas, and he turns to the other men in the hospital for advice. A patient's dreams may be crushed by a condition he doesn't realize he has.
Season 4, Episode 7: Physical Attraction... Chemical Reaction
Original Air Date—8 November 2007
George confides in Meredith that sex with Izzie is horrible, saying she tries to hard. George's patient is a young boy who swallowed a marble. Sloan and Izzie have a woman who's getting a face lift.
Season 4, Episode 8: Forever Young
Original Air Date—15 November 2007
When a high school crush shows up in the ER, Miranda must choose between him and a busload of students who were involved in an accident. The Grey sisters avoid their father when he shows up at the hospital drunk. Derek attempts dating another doctor and Cristina works to get back into Hahn's good graces.
Season 4, Episode 9: Crash Into Me: Part 1
Original Air Date—22 November 2007
Two paramedics fight for their lives, caused by an accident in the ER. Cristina and Izzie compete for cardio. Derek and George help a paramedic with seizures. Another paramedic refuses treatment from Bailey. Ava returns for Alex and happens to meet his other girlfriend. Lexie starts bonding with a new patient.
Season 4, Episode 10: Crash Into Me: Part 2
Original Air Date—6 December 2007
The doctors at Seattle Grace try to save paramedics who are trapped in an overturned ambulance. Bailey's marriage continues to suffer as she spends more time trying to save lives, and less at home with her family. Her husband has trouble accepting her devotion to her job. Cristina tries to improve her relationship with Hahn so she can work with her.
Season 4, Episode 11: Lay Your Hands on Me
Original Air Date—10 January 2008
Bailey is distraught when her young son arrives at the ER needing medical attention. Derek pushes Meredith do commit more to him, and Meredith struggles with the pressure. Callie tries to cope with her and George no longer being married. George is surprised by a visitor he had no idea was coming.
Season 4, Episode 12: Where the Wild Things Are
Original Air Date—24 April 2008
Rose tells Lexie that she loves Derek, as Meredith listens in. Webber scolds Bailey, for keeping her residents at the hospital for two weeks. Meredith wins a surgical contest, which means she gets first dibs on all surgeries for the nest three months. George decides he wants to stay in the apartment with Lexie.
Season 4, Episode 13: Piece of My Heart
Original Air Date—1 May 2008
Addison Montgomery comes back to consult on a difficult pregnancy. She's amazed to see how much has changed at Seattle Grace, with Derek and Meredith broken up and Callie divorced. Babies are the spirit of the hour, as Rebecca also returns to tell Alex that she is with child. However, this turns out to be false. Izzie also explores her relationship with the interns in the free clinic.
Season 4, Episode 14: The Becoming
Original Air Date—8 May 2008
The nurses at the hospital refuse to work with Mark, due to his numerous trysts, which causes the hospital to instate a "date and tell" policy. Cristina tries to work through her feelings for Burke, while Meredith continues her therapy. Meredith and Derek's newest clinical trial patient turns out to be a gay veteran soldier.
Season 4, Episode 15: Losing My Mind
Original Air Date—15 May 2008
Cristina is still in a slump and her behavior towards others begins to get more and more volatile. Izzie finally confronts Ava/Rebecca. A patient with a Cinderella story affects Meredith, who has been quite angry with her therapist. Bailey works with her child, who has been having issues with hitting other children at day care. Derek and the Chief both have trouble with the women in their life.
Season 4, Episode 16: Freedom
Original Air Date—22 May 2008
While a surgical team races the clock to save a boy who has been encased in cement, Derek and Meredith are given one last chance to work on their clinical trial. Alex's judgment is questionable as the painful situation with Ava brings up past memories that are better left alone.