Foster's Home for Imaginary Friends Season 3 Episode 4

Imposter's Home For Um...Make 'Em Up Pals

Goofball John McGee comes to Foster's, who is a total pain. Frankie thinks he's a teenage kid passing himself off as a imaginary friend, who always needs help on homework, needs to wash his jerseys, and eats all the food that Frankie bought from the store, but everyone else believes otherwise. So now, Frankie is out to prove him as a fraud. But is he really the fraud Frankie thinks he is?