Kovac (Goran Visnjic) again treats the stubborn Bishop Stewart (John Cromwell). Sixteen-year-old cardiac patient Nick Stevens (Josh Peck) balks at having another heart transplant. Another patient, a gay man named Jeff (Robert Beitzel), refuses to use contraceptives, and indeed seems eager and willing to contract the AIDs virus. Greene's (Anthony Edwards) erratic behavior increases. And Carter (Noah Wyle) asks Abby (Maura Tierney) to be his date at a gala charity function -- leading to an uncomfortable "reunion" for Abby. ~ Hal Erickson, Rovi