Zach Braff Dr. John "J.D." Dorian Actor, Director 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 David Downs Mr. Bolger Guest Star Johnny Kastl Doug Guest Star Sam Lloyd Ted Guest Star Robert Maschio Todd Guest Star Philip McNiven Roy Guest Star Christa Miller Jordan Guest Star George Miserlis Crispin Guest Star Paul F. Perry Randy Guest Star Travis Schuldt Keith Guest Star Aloma Wright Nurse Roberts Guest Star Rene Hall Intern Guest Star Scott Rabideau Another Intern Guest Star India King Elliot's Intern Guest Star Bill Lawrence Executive Producer Garrett Donovan Writer Neil Goldman Writer