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For information about Captain Kruppy the Underpants Kid's alter ego, see Kruppy the Kid.

  —Captain Kruppy The Underpants Kid.  

Captain Kruppy the Underpants Kid is Captain Underpants in Melvin Sneedly's body. George Beard gave him this title after Mr. Melvin snapped his fingers. After they were morphed together and subsequently separated by the Combine-O-Tron 2000, Mr. Krupp's and Melvin's brains got changed, thus causing Kruppy the Kid to transform into the half-naked superhero. He only appears in Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy - Part 2: The Revenge of the Ridiculous Robo-Boogers.

He is voiced by Len Forgione in the Sound-O-Rama Audiobooks.


Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy - Part 2: The Revenge of the Ridiculous Robo-Boogers[]

When Mr. Melvin snaps his fingers upon getting the idea to build a time machine to retrieve the destroyed Combine-O-Tron 2000 and switch back to his correct body, Kruppy the Kid turns into Captain Underpants (or more accurately, Captain Kruppy the Underpants Kid) and flies away, despite George and Harold attempting to stop this. Mr. Melvin then makes George and Harold tell him everything about Captain Underpants.

Meanwhile, Captain Kruppy spends the ensuing two days trying to help the citizens of Piqua, but his attempts often backfire horribly. First, he tries to help some old ladies across the street, but then finds a kitten stuck in a tree. Captain Kruppy rescues the kitty, but leaves the old ladies in the tree. Next, whilst flying over the football field, Captain Kruppy notices a football and mistakes it for a UFO. He then grabs it and flies down to the football field to announce his intent to destroy the football, inadvertently making the Purple Dragon Sing A-Long Friends lose their biggest game of the year. Finally, Captain Kruppy breaks some skateboarders' skateboards and spanks the skateboarders for skateboarding in a no skateboarding zone.

Upon retrieving the Combine-O-Tron 2000 from the day before yesterday, Mr. Melvin makes George and Harold call for Captain Kruppy so they can switch bodies back. When he arrives, he is tricked into posing for a photo, and, along with Mr. Melvin, is then zapped by the Combine-O-Tron 2000. This works, and after they switch bodies back, Captain Underpants (upon taking off his clothes) hears the P.O.O.P.S.I.E. astronauts being accosted by the Robo-Boogers, and leaps out the window to help them...only to fall three stories to the ground. It is soon revealed that this is because, while they switched back to their correct bodies, Melvin kept Captain Underpants' superpowers, soon adopting the moniker, 'Big Melvin'.


  • He is only called "Captain Kruppy the Underpants Kid" once by George; the rest of the time, he is simply called "Captain Underpants".
  • The gag where Captain Kruppy leaves the old ladies in the tree is referenced in the First Epic Movie, when Captain Underpants throws an old lady into a tree.