After Dr. Bailey is called into surgery, Cristina is forced to watch baby Tucker for the remainder of the day. Meanwhile, George and Meredith are still on the outs as she confides in Derek with her problem. Izzie continues to warm up to Denny who is having problems breathing. George and Callie further their flirtations over a teenaged patient who decides to chop off his own finger after Callie refuses to do it for him. Burke shows a preference for living with George over Cristina, and Addison gets a long-awaited admission from Derek that shows some hope for their marriage after all.