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 Travis Schuldt Keith Guest Star Johnny Kastl Doug Guest Star Robert Maschio Todd Guest Star Christa Miller Jordan Guest Star Michael Learned Mrs. Wilk Guest Star Shaughn Buchholz Jason Guest Star Ellerine Old Woman Guest Star Bobby Foster Janitor's Cronie Guest Star Callard Harris Attractive Guy Guest Star Aaron Ikeda Rex Guest Star Rachel Jackson Nurse Guest Star Kellie Madison Sexy Girl Guest Star Marisa Petroro Cavewoman Guest Star Jack Yang Patient Guest Star Bill Lawrence Executive Producer Randall Keenan Winston Director Mark Stegemann Writer