- Captain Blunderpants is the evil counterpart of Captain Underpants. He is from the opposite "Purple Potty" universe. He was defeated by George and Harold's grandparents. When he is Mr. Krupp he is nice. But when he is Captain Blunderpants he is mean and evil. Contrasting from the Captain Underpants in the regular universe, when water is poured on his head, he becomes Captain Blunderpants. But when someone snaps their fingers he turns back into Mr. Krupp. Also, when Captain Blunderpants is in his bad form he has a toupee. But when he's in Mr Krupp form he does not wear a toupee. He is the secondary antagonist of Captain Underpants and the Preposterous Plight of the Purple Potty People.
Captain Blunderpants is evil and very mean. But when he is in Mr. Krupp form he is the best principal you would know.
Captain Underpants and the Preposterous Plight of the Purple Potty People
Continuing from the previous book, George, Harold, Sulu, and Crackers have ended up in an alternate universe where it is the opposite of their world. George and Harold discover that Mr. Krupp is nice and does not wear a toupee in this universe. They then see their evil counterpart, Evil George and Evil Harold, and learn through one of their more accurate comics that they had transformed their principal into a villain named Captain Blunderpants, the opposite dimension form of Captain Underpants. Sulu and Crackers are kidnapped by Evil George and Evil Harold and they use the 3D Hypno-Ring to hypnotize them into being evil. Sulu attacks the Good George and Good Harold. Crackers, on the other hand, saves them (though George and Harold can't figure out why).
The duo finally get back to their dimension of the multiverse, but unintentionally bring Evil George, Evil Harold, the good Mr. Krupp, and Sulu with them. Evil George and Evil Harold get water on good Mr. Krupp's head, transforming him into Captain Blunderpants.
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While his opposite sings "Tra-La-Laaaaaaa!", Captain Blunderpants sings "La-La-Traaaaaaaaa!" Also, like Captain U. drank super power juice to get stronger, two trucks crashed on Captain B., giving him superpowers.