Winston Story

Addison, Naomi and Sam rush Archer to Seattle Grace, where they reunite with old friends in hope of saving his life; Izzie devises a medical game to teach the interns; Owen runs into someone significant from his past.

A plumbing leak becomes a flood, causing chaos at Seattle Grace; the chief tries to implement new teaching policies; George tries to take his residency exam again; Derek hopes to move Meredith's roommates out of her house.

Derek finds an old diary of Meredith's mother; Callie anxiously prepares for her first real date with Erica; Cristina stumbles into a part of the hospital that she and the other residents have never seen.

Members of the hospital staff find unique ways to deal with their grief at George's death; George's mother faces the daunting task of deciding what to do with his organs.

Derek looks for the perfect way to propose to Meredith; Lexie wants Mark to go public with their relationship; Bailey considers taking her medical career in a new direction.

Everyone in the hospital tries to find a new organ donor for a patient; Mark is left in a compromising position; Cristina tries to avoid Owen.