Zach Braff [as Dr. O.D.]; Ken Jenkins [as Dr. Throb Hellshow]; John C. McGinley [as Dr. Pill Box]; Judy Reyes [as Nurse Carlot]; Donald Faison [as Priss Jerk]; Sarah Chalke [as Dr. Smelliot Bleed]; Neil Flynn [as the Janitor]; Doc (cameo); Bugs Bunny (cameo); Dick Cheney (cameo); Noah Wylie (cameo); Fred Flintstone (cameo); Quick Draw McGraw (cameo)