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 Graham Dr. Molly Clock Guest Star Cary Brothers Himself Guest Star Tim Conlon Dean Guest Star Kathryn Joosten Mrs. Tanner Guest Star Johnny Kastl Doug Guest Star Sam Lloyd Ted Guest Star Robert Maschio Todd Guest Star Jack Shearer Mr. Simon Guest Star Jill Tracy Elaine Guest Star Aloma Wright Nurse Roberts Guest Star Carol Herman Mrs. Carter Guest Star Joseph Limbaugh Guy Guest Star Kevin Lowe Mr. Daniels Guest Star Connor Patterson Sammy Guest Star Ted Rogers Mr. Bursky Guest Star Bill Lawrence Executive Producer Ken Whittingham Director Tad Quill Writer