Greene (Anthony Edwards) confronts unforeseen perils as he flies to Indiana and back with a heart-transplant patient. Carter (Noah Wyle) treats teenaged patient Trent Larson (Blake Heron), whose parents have not informed him that he is HIV-positive. Kovac (Goran Visnjic) tries to learn the identity of the mugger he has killed. And no sooner has Benton (Eriq La Salle) returned to work than he is placed in charge of the ER. ~ Hal Erickson, Rovi