2x18 Yesterday
Meredith and Burke treat a patient who probably won't survive surgery. The patient asks Meredith to videotape where he vents out to everything who's ever wronged him. Cristina and Alex work with Derek on the case of a teenager with Lionitis -- but his disfigured appearance doesn't keep him from flirting with Cristina. George and Izzie attend to a patient with Addison -- a woman suffering from spontaneous orgasms. Personally, Mark, Derek's best friend who slept with Addison, returns to convince Addison to come back to him. But he winds up moving in on Derek's case instead (when he's not hitting on Meredith). Burke finds out that Cristina didn't really move in with him -- she still has another apartment.