Grey's Anatomy Season Four

Special. Come Rain or Shine: From Grey's Anatomy To Private Practice
This episode recaps all of the seasons of Grey's Anatomy and sets up the spin-off series, Private Practice, by relating Addison's story. It also includes a preview of Private Practice.
A Change is Gonna Come
Entering their first year as residents, Meredith Grey, Cristina Yang, Izzie Stevens and Alex Karev now have interns of their own to mentor. The interns are welcomed by new chief resident Callie. Among the new interns are George, forced to repeat his internship after failing his exams, and Lexie Grey, Meredith's half-sister. Many 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 their new stressed out interns. A young boy brings his bleeding deer to the hospital in the hope a doctor will save her. Cristina searches for Burke. Richard resumes his post as chief of surgery. Derek and Meredith reach an impasse. Bailey wrestles with things at the hospital not turning out like she thought they would.
Love/Addiction
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 an elderly resident of the apartment 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.

Let The Truth Sting
A woman named Marcy brings in her son, Hunter, because she finds his change in behavior suspicious. A patient named Connie may lose her ability to talk 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. Meredith and Lexie work on a patient. The doctors meet a unique intern.
The Heart of the Matter
A face familiar to one of the year-twos shows up and dredges up issues that were never really dealt with. A teen football player needs counseling because of his father and surgery for an injury he sustained while playing the game. The girl who was the reason for the prom at Seattle Grace returns and she brings her aunt Adele with her. Camille finds out that her cancer is back.
Haunt You Every Day
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. Alex receives a visit from Jane Doe/Ava/Rebecca. Meredith is having mommy issues. Callie has an announcement to make.
Kung Fu Fighting
Cristina and Izzie are fighting for surgeries and a favor from someone. A patient comes to the ER with a dream and a condition which may prevent him from realizing it. The Chief turns to the other men in the hospital when his marriage is in more trouble. Two patients are competing to win something big. One of them convinces an intern to take their place.
Physical Attraction... Chemical Reaction
Two arguing parents, who are named Jane and Don, bring their son in because he swallowed marbles, 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.
Forever Young
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
Crash Into Me (1)
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.
Crash Into Me (2)
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.
Lay Your Hands on Me