.........and Lexie begins stealing stuff from the hospital to furnish it. Callie and Erica continue their friendship.
Piece of My Heart:
Addison (Kate Walsh) returns to Seattle Grace to perform an operation and is surprised by all the changes in the lives of her former co-workers; Derek and Meredith's clinical trial has its first patient (Jason O'Mara); Rebecca returns with shocking news for Alex.
A "date and tell" policy is instated at Seattle Grace after the nurses object to Mark's trysts, Cristina has to face her feelings for Burke and Meredith and Derek admit a gay veteran soldier into their clinical trial.
Losing My Mind:
Dr. Wyatt (Amy Madigan) refuses to let Meredith give up on therapy, Alex learns the truth about Rebecca's medical condition, the Chief insists that Erica perform a risky surgery on his mentor, and after receiving news of Burke, Cristina continues to do things contrary to her nature, going so far as cleaning her always-messy apartment.