Zach Braff Dr. John "J.D." Dorian Actor Sarah Chalke Dr. Elliott Reid Actor Donald Faison Dr. Chris Turk Actor John C. McGinley Dr. Perry Cox Actor Judy Reyes Nurse Carla Espinosa Actor Ken Jenkins Dr. Bob Kelso Actor Neil Flynn The Janitor Actor Jimmie Walker Jimmie Walker Guest Star Christa Miller Jordan Sullivan Guest Star Gina Morelli Mother Guest Star Sam Lloyd Lawyer Guest Star Mark Chaet Dr. Greenberg Guest Star Angee Hughes Nurse Guest Star Earl Schuman Patient Guest Star Bill Lawrence Executive Producer Marc Buckland Director Gabrielle Allan Writer