George and Harold won't be able to participate in this year's science fair. That's because they glued Principal Krupp to his chair at last year's science fair. But that won't stop them from messing with the science projects. So the electric dog washer shoots out black ink, the model volcano blows out butterscotch pudding, and the boys end up in detention. With time to kill, they create a new Captain Underpants episode, this one with attacking toilets. But when the school science genius turns the cartoon into reality, it's time for Mr. Krupp to transform into everyone's favorite underwear-wearing superhero! Series Information When fourth graders George and Harold accidentally hypnotize their principal, Mr. Krupp, they turn him into Captain Underpants, the world's most underdressed superhero. All it takes is a snap of the fingers to let this caped crusader loose upon a world of talking toilets, lunchroom zombies, purple potty people, and other outrageous villains. Mr. Krupp has no idea what's happening — which makes it even funnier, since he can't stand George and Harold and would never do what they command. But he always manages to save the day anyway, with thrills and laughs to spare.