Grey's Anatomy: Season 5, Episode 15

5 - 15: Before and After

Addison (Kate Walsh) arrives with her brother Archer (Grant Show), who has worms in his brain. Cristina learns that Owen was engaged and has family over, but Iraq has changed him so much that he doesn't want his mum to see how hard he has become and Bailey considers a pediatric surgery fellowship. Izzie makes the interns play a surgery-game and George finds out that Sadie is behind with her skills, forcing her to make a decision. Derek grabs the chance to relive his med-school days with Addison and the rest of the LA-crowd. Cross-over with Private Practice. Guest starring Taye Diggs, Audra McDonald, Grant Show, and Kate Walsh.