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 Sam Lloyd Ted Guest Star Eliza Coupe Denise Guest Star Sonal Shah Sunny Guest Star Marcia Ann Burrs Peggy Guest Star Kate Micucci Stephanie Guest Star Ryan Grassmeyer Rudy Guest Star Sydney Jay Ross Guest Star Bill Lawrence Executive Producer John Putch Director Debra Fordham Writer Andy Schwartz Writer