Captain Kruppy the Underpants Kid

"Tra-La-Laaaaaa!"

- Captain Kruppy the Underpants Kid' catchphrase

Captain Kruppy the Underpants Kid is Captain Underpants in Melvin Sneedly's body. Harold Hutchins gave him this title after Mr. Melvin snapped his fingers, 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, Kruppy the Kid turns into Captain Underpants (or more accurately, Captain Kruppy the Underpants Kid). Mr. Melvin then makes George and Harold tell him everything about Captain Underpants.

Meanwhile, Captain Kruppy helps a little girl get her cat out of a tree (getting two old ladies stuck in the tree in the process), breaks gangsters' skateboards, and deflates the Purple Dragon Sing-Along Friends ball (ruining their biggest game of the year).

Mr. Melvin makes George and Harold call for Captain Kruppy, so they can switch bodies. They do, and Captain Underpants flies out the window... only to fall three stories to the ground.