The OR staff has its hands full with the victims of a spectacular car crash caused by flagrantly careless driver Bob Seibert. In the course of events, it is revealed that Seibert is a drug abuser, wife beater and all-around louse--and he is also in desperate need of a liver transplant. Ironically, the perfect donor turns out to be the very man whom Seibert killed on the road, placing the surgical interns smack in the middle of a major ethical dilemma. Elsewhere, George (T.R. Knight) is forced to work side by side with the same nurse who gave him syphillis; Webber (James Pickens Jr.) gets what-for from his wife (Loretta Devine) for having brain surgery without her knowledge; Meredith (Ellen Pompeo) and Cristina (Sandra Oh) do their best to lose themselves in their work and forget their romantic travails; and we finally find out the reason for the rift between Derek (Patrick Dempsey) and Addison (Kate Walsh). ~ Hal Erickson, Rovi