Someone named Goofball John McGee stumbles onto the Foster's property. Frankie thinks he's not really an imaginary friend, just a fraud; really a teenage kid in disguise, but everyone else believes otherwise. He always needs help with stuff, always at Frankie's expense. She is even more infuriated when they refuse to believe her when they think he really is an imaginary friend. So Frankie is more than anxious to expose him as a fake.
—Anonymous