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 John Ritter Sam Dorian Guest Star Hattie Winston Margaret Turk Guest Star Markie Post Lily Reid Guest Star Lane Davis Simon Reid Guest Star R. Lee Ermey Janitor's Father Guest Star Matt Winston Dr. Jeffrey Steadman Guest Star Alexandra Lee Young Elliot Guest Star Colin Martin Patient Guest Star David S. Robinson Hicks Young Turk Guest Star Bill Lawrence Executive Producer Adam Bernstein Director Matt Tarses Writer