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 Robert Maschio Todd Guest Star Sam Lloyd Ted Guest Star Sonal Shah Sunny Guest Star Kit Pongetti Lady Guest Star Todd Bosley Howie Guest Star Andrew Miller Baby Jack Guest Star Eliza Coupe Denise Guest Star Betsy Beutler Katie Guest Star Kate Micucci Stephanie Guest Star Aziz Ansari Ed Guest Star Lee Thompson Young Derek Guest Star Taran Killam Jimmy Guest Star Christa Miller Jordan Guest Star Bill Lawrence Executive Producer, Director, Writer Kevin Biegel Writer John Putch Director Debra Fordham Writer Taii K. Austin Writer Dave Tennant Writer Clarence Livingston Writer Janae Bakken Writer Devin Mahoney Writer Aseem Batra Writer Angela Nissel Writer Michael Alan Spiller Director Bill Callahan Writer Neil Goldman Writer Mark Stegemann Director Linda Mendoza Director Will Mackenzie Director Andy Schwartz Writer