"Principal Krupp once again turns into the superhero Captain Underpants in order to save the world, and Jerome Horwitz Elementary School, from the evil talking toilets and the Turbo Toilet 2000"-cProvided by publisher.

"Me llamo A.J., y en mi colegio pasa algo muy raro...El director se ha subido al palo de la bandera, ha besado en la boca a un cerdo, se ha pintado la calva de naranja fosforito... ¡y quiere saltar del tejado vestido de Papá Noel!"--

When Professor Pippy P. Poopypants comes to Jerome Horwitz Elementary School to teach science, and he goes off the deep end because students make fun of his name, only Captain Underpants can save the school from the professor's perilous plot.

When George and Harold hypnotize their principal into thinking that he is the superhero Captain Underpants, he leads them to the lair of the nefarious Dr. Diaper, where they must defeat his evil robot henchmen.

"Prepare for plenty of giggles as a kindergarten class arrives for their first day of school, but can't find their teacher--only a delicious-looking sandwich and the words 'Mr. S' scribbled on the chalkboard. Chaos ensues as the kids argue whether or not the sandwich must be their teacher"--