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 Jay Kenneth Johnson Dr. Matthews Guest Star Robert Maschio Todd Guest Star Aloma Wright Nurse Roberts Guest Star Keith Allan Bartender Guest Star Yvonne Arias Nurse Martinez Guest Star Matt Bush Teenage Boy Guest Star John David Conti Patient Guest Star Carole Goldman Mrs. Goldstein Guest Star Michael Hobert Lonnie Guest Star Joe Rose Troy Guest Star Randall Keenan Winston Leonard Guest Star Greg Wittman Intern Guest Star Bill Lawrence Executive Producer Linda Mendoza Director Mike Schwartz Writer