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 Johnny Kastl Doug Guest Star Sam Lloyd Ted Guest Star Robert Maschio Todd Guest Star Christa Miller Jordan Guest Star Travis Schuldt Keith Guest Star Aloma Wright Nurse Shirley Guest Star Katie Gill Marian Guest Star Paul Kwo Potions Tech Guest Star Andrew Miller Baby Jack Guest Star Tyler Poelle Boon Guest Star Lindsay Ravage Slagathor Guest Star Bill Lawrence Executive Producer Mark Stegemann Writer