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 Heather Locklear Julie Keaton Guest Star Robert Maschio Todd Guest Star Cody Estes Young J.D. Guest Star Paige Peterson Nurse Guest Star Cole Williams Mike Guest Star Jennifer Elia Nurse Guest Star Bill Lawrence Executive Producer Lawrence Trilling Director Mike Schwartz Writer