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 D.L. Hughley Kevin Turk Guest Star Dick Van Dyke Dr. Townshend Guest Star Charles Rahi Chun Dr. Wen Guest Star Christa Miller Jordan Sullivan Guest Star Sam Lloyd Ted Guest Star Robert Maschio Todd Guest Star Robert Beckwith Roy Guest Star Julie Hudson Dr. Gerson Guest Star George Miserlis Crispin Guest Star Paul F. Perry Randall Guest Star Joe Rose Troy Guest Star Geoff Stevenson Mr. Singer Guest Star Bill Lawrence Executive Producer Michael Alan Spiller Director Eric Weinberg Writer