The impossible has happened -- Derek has actually moved in! However, he assumes that this means that Meredith is kicking out Izzie and Alex, which Izzie learns when she finds Derek measuring her bedroom to become his office. For someone who just came from living in a trailer, I'd think he'd appreciate just having a living room where he couldn't touch the opposite walls at the same time, at least for a little while. But this sends Izzie down into the dumps, which isn't helped by the fact that Alex is still being mean to her. Derek even tries to get Cristina on his side, but though she admits she would kick the other two out, she gets mad at him for the little ploy. She goes and talks to Dr. Amy (Meredith earlier announced that she was all better and finished with therapy) and begs Dr. Amy to tell Meredith she still needs help. Mere and Dr. A then meet in the elevator for some touching words about how she's doing better but she isn't finished with needing therapy. Amen!

Callie and Hahn are apparently still a secret to everyone but Mark. This freaks Hahn out, even more so when she realizes that Callie told him all about it because she and Mark are buddies. Callie finally convinces Hahn that she's friends with Mark, she's the kind of person who likes discussing her life with a friend, and she's not going to stop being herself in this relationship, which Hahn actually takes quite well. I may still feel like this is a forced storyline, but it might just be the healthiest relationship that this show has ever seen thus far. When he's not teasing the happy new couple, Mark is still giving Lexie crap for mooning around after George. She diagnoses a really rare condition in a patient but when Mark offers her the chance to scrub in on the surgery, she declines because she's helping out George. He was supposed to take his intern test, but ended up offering to help the Chief when disaster struck.

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