Candice Afia

Seattle Grace institutes a "date-and-tell" policy after the nurses complain of Mark's trysts; Cristina is forced to confront her feelings about Preston.

The hospital has a pipe break which causes a huge flood; Meredith quits therapy but Dr. Wyatt doesn't believe she is finished.

Major Owen Hunt returns to be the head of ER trauma; Meredith finds an old doll her mother gave her when she was 5.

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.

An ambulance crash endangers the lives of the paramedics involved, as Meredith and the Chief work on-site to save them, Bailey treats a patient who refuses her help.

Cristina and Meredith try to put their differences aside to treat a prisoner on death row with a serious brain injury; Bailey is put on her heels by a new pediatric surgeon.