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 Sean Hayes Nick Guest Star Robert Maschio Todd Guest Star Aloma Wright Nurse Roberts Guest Star Charles Rahi Chun Dr. Wen Guest Star Cody Estes Young J.D. Guest Star Johnny Kastl Doug Guest Star Time Winters Jesus Guest Star Nikki Martin Nurse Guest Star Bill Lawrence Executive Producer Peter Lauer Director Mike Schwartz Writer