Winston Story

Cristina uses Meredith to get the solo surgery which Alex is also trolling for; Derek discovers he has a form of epilepsy; the interns perform surgery on Sadie which goes terribly awry, exposing their little club.

Bailey arranges a domino kidney surgery involving all the residents and interns; Meredith is upset Derek didn't include her in the article on their clinical trial.

Addison (Kate Walsh) returns to Seattle Grace to perform a surgery and is surprised to learn about the changes in her former coworkers' lives.

Izzie returns to work while the Seattle Grace residents fear possible layoffs; Bailey and Alex's difficult case is further complicated by her schizophrenic son.

Addison, Naomi and Sam rush Archer to Seattle Grace to try and save his life; Owen runs into a significant someone from his past; Izzie employs her fellow doctors in a medical game to teach the interns.

Meredith's old friend, Sadie comes to Seattle Grace making Cristina jealous; Richard looks to woo the new surgeon; the interns start cutting each other to practice their suturing techniques.