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 Sam Jaeger Steve Larkin Guest Star Sam Lloyd Ted Guest Star Robert Maschio Todd Guest Star Jill Tracy Elaine Guest Star Aloma Wright Nurse Roberts Guest Star Daniel Edward Mora Father Guest Star Kit Pongetti Dr. Mitchell Guest Star Toni Ann Rossi Sandy Larkin Guest Star Joey Saravia Ralphie Guest Star Bill Lawrence Executive Producer, Writer Chris Koch Director