Bishop Stewart returns, seeking pain medication from Luka, who also has his hands full dealing with the parents of a 16-year-old who does not want another heart transplant. Abby fills in as Carter's date for a Carter family function and sees her ex-husband there. Malucci treats a gay man who wants to contract HIV from his positive partner. Greene continues an abrupt personality change in the wake of his surgery. Weaver makes an appointment for a competency review for Mark.