Cathryn de Prume

Derek and the attendings go out to celebrate when he gets the grant he needs for his clinical trial; Meredith and Alex must fend for themselves during the night shift.

Angus uses his background in psychology to help a woman who doesn’t remember how she injured herself and others. Also, when Christa bonds with an illegal immigrant whose son is diagnosed with cystic fibrosis, she becomes determined to help the woman find long-term care for her son in the U.S.

Lt. Bale, the new commanding officer, alienates the squad; Ortiz partners with a flirtatious rookie; Clark drinks and womanizes after the death of his former girlfriend; Sipowicz has a stalker.