Everyone reminisces about the past. Meanwhile, Izzie is emotionally devastated, with the others trying to help her, Adele gives Richard an ultimatum, and George and Derek are put in quarantine when an outbreak of the plague is suspected.
When Izzie has a mental collapse after Denny's death, Izzie and Cristina turn to Meredith to try and make it better for her. Callie tries to cope with George not returning the three word sentiment she said to him. Meanwhile, back at the hospital, Alex and Addison deal with a baby left in a garbage can at a local high school, Richard receives an ultimatum from his wife, and Derek and George are quarantined in the locker room due to a patient suspected of having the plague.—Moviedude1
The doctors of Seattle Grace help Izzie cope with the loss of her fiancé, Denny, and her decision to quit the internship program. Meredith must decide what the future holds after her hospital liaison with Derek. The Chief is confronted by his wife, Adele, after spending the night in his office, and George seeks relationship advice from a surprising source.—Alex