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 Elizabeth Banks Dr. Kim Briggs Guest Star Christa Miller Jordan 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 Travis Schuldt Keith Guest Star Aloma Wright Nurse Roberts Guest Star Aaron Ikeda Rex Guest Star Christina Miles Gloria Guest Star Andrew Miller Baby Jack Guest Star Edward Tinney Dr. Fulton Guest Star Jordan Zucker Lisa Guest Star Bill Lawrence Director Aseem Batra Writer Kevin Biegel Writer