Kim Possible - Season 4 Episode 21

Obsessed with his inability to steal Kim's indestructible battle suit, Professor Dementor sends his henchmen to kidnap "that boy who hangs out with Kim Possible but doesn't look like he belongs with her." But instead of Ron, they end up with Kim's nerdy Cousin Larry, who she reluctantly agrees to distract while the rest of the Possible family prepares a surprise birthday party for him. To make matters worse, Larry is convinced that his kidnapping is a role playing game, and is oblivious to the dangers that he's facing… or could cause, while under Dementor's custody.