S4, E23: When the brother of an elderly patient tries to sue his sister's well-intentioned neighbor (guest star Josh Randall, "Ed") for helping her decide what course of treatment to take, J.D. (Zach Braff) begins to question his faith in humanity. Meanwhile, Turk (Donald Faison) struggles with sharing his true feelings about his relationship with Carla (Judy Reyes) when the two begin couples therapy. On the verge of giving up on men altogether, Elliot (Sarah Chalke) reluctantly seeks advice from Dr. Cox (John C. McGinley) on how to catch the eye of the handsome hospital visitor. Ken Jenkins and Neil Flynn also star.