Pratt struggles to diagnose a woman who suffers mysterious chronic seizures. An attractive woman, Campbell (Ashley Laurence), informally accuses flirtatious Pratt of sexual harassment. Abby ponders how to get her contentious patients' attention during her psychiatric department rotation. And Neela studies strokes in a lab populated by brainy but bizarre graduate students. Meanwhile, Sam tries to resist the appeal of her son's reformed father, Steve (recurring guest star Cole Hauser), when he temporarily moves into her apartment--making Kovac concerned. In addition, Weaver vows to fight for her baby son, and Chen is tested when she brings her combative, ailing father home.