Agent Duper is Stan's rival at the CIA who, claiming to be "a big fan", is effectively replacing Stan by beating his time on the test course, taking his bran muffin and analyzing terrorist chatter while Stan is bumped down to terrorist banter in "Roger Codger".
He has a crowd scene cameo in "100 A.D." where he dies in a bus crash. He returns as a clone of himself in "Son of Stan" where he states that he is the same except the old Duper was "married to some ugly bitch".
In these appearances he is voiced by Phill Lewis.
- AD105 Roger Codger
- AD110 All About Steve
- AD111 Con Heir
- AD112 Stan of Arabia: Part 1
- AD116 Not Particularly Desperate Housewives
- AD210 Bush Comes to Dinner
- AD214 An Apocalypse to Remember
- AD215 Four Little Words
- AD217 I Can't Stan You
- AD314 Office Spaceman
- AD404 Choosy Wives Choose Smith
- AD406 Pulling Double Booty
- AD407 Phantom of the Telethon
- AD411 Live and Let Fry
- AD601 100 A.D.
- AD602 Son of Stan
- AD614 School Lies
- AD716 "The Kidney Stays in the Picture"