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 Stephanie D'Abruzzo Patti Guest Star Johnny Kastl Doug Guest Star Sam Lloyd Ted Guest Star Robert Maschio Todd Guest Star Philip McNiven Roy Guest Star George Miserlis Crispin Guest Star Paul F. Perry Randall Guest Star Aloma Wright Nurse Roberts Guest Star Kym Hoy Patient 1 Guest Star Adam Hunter Patient 3 Guest Star Mike Schwartz Delivery Man Guest Star Jennifer Leigh Warren Patient 2 Guest Star Karen Ziemba Radiologist Guest Star Bubba Dean Rambo Dancer Guest Star Erin Stoddard Singing Nurse Guest Star Troy Christian Paramedic Guest Star Gordon Hart II Dancer Guest Star Anthony Marciona Fat Man Guest Star Bill Lawrence Executive Producer Will Mackenzie Director Debra Fordham Writer