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 Robert Maschio Todd Guest Star Sam Lloyd Ted Guest Star Todd Bosley Howie Guest Star Bob Bencomo Colonel Doctor Guest Star Frank Cameron Dr. Mickhead Guest Star Marcy Minton Nurse Barbara Guest Star Lewis Dauber Mr. Vaughn Guest Star Helen Geller Mrs. Fishman Guest Star Mary Passeri Nurse Nelly Guest Star Richard A Wells Dr. Wells Guest Star Bill Lawrence Executive Producer Dave Tennant Writer Will Mackenzie Director