Candice Afia

Bailey and Seattle Grace's new pediatric surgeon try to save the life of a longtime patient; the admission of a death row inmate angers Derek; Izzie tells Alex that she has been seeing Denny.

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.

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.

Cristina and Burke's wedding day arrives - along with the interns' first exam results - and a successor to the Chief is named, as Callie and George make a big decision about their relationship.

An ambulance crash endangers the lives of the paramedics involved; Bailey treats a patient who refuses her help; Ava returns for Alex and meets his other girlfriend.

Meredith tries to convince Derek to come back to work; Mark attempts a face transplant surgery; Izzie tries to keep her medical condition a secret.