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 Elizabeth Bogush Alex Guest Star Michael McDonald Mike Davis Guest Star Sam Lloyd Lawyer Guest Star Jimmie Walker Jimmie Walker Guest Star Aloma Wright Nurse Roberts Guest Star Johnny Kastl Doug Guest Star Randall Keenan Winston Death Guest Star Bill Lawrence Executive Producer Marc Buckland Director Mark Stegemann Writer