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.

The monstrous Turbo Toilet 2000 is determined to take revenge on George, Harold, and Captain Underpants.

George and Harold are always good at using their imaginations, and that drives their mean homeroom teacher, Ms. Ribble, crazy! But this time, they've come up with much more than a silly prank they've accidentally created a MONSTER! With her horrendous hairdo and two rabid robots, Wedgie Woman is well on her way to world domination, and only the Waistband Warrior can stop her!

"In this ninth epic novel, Dav Pilkey takes readers back in time to the carefree days of kindergarten, when the worst thing George and Harold had to face was NOT evil mad scientists or alien cafeteria ladies but a sixth-grade bully named Kipper Krupp, the nephew of their clueless school principal. And because George and Harold don't actually invent Captain Underpants until fourth grade, the two clever kindergartners are on their own -- using their...

George and Harold are forced to contemplate a world without Captain Underpants.

George and Harold's nemesis Melvin Sneedly goes from snooty to snotty in the sixth book in this #1 New York Times bestselling series by Dav Pilkey, the author and illustrator of Dog Man!

George and Harold are up to their old tricks again, and when their latest prank makes a direct hit on school brainiac Melvin, he decides to get even! But in the blink of an eye — and the sneeze of a nose — the Bionic Booger Boy is born! Can...

Jorge and Berto's latest "Captain Underpants" adventure casts one of their teachers, Professor Pipicaca, as a mad scientist trying to take over the world in a gigantic robot. Jorge y Berto no son malos chicos. Lo que pasa es que les gusta animar las cosas de vez en cuando. Así, sin proponérselo, están a punto de hacer que un científico enloquecido y sin escrúpulos, a bordo de un robot gigantesco, se apodere del planeta entero... ¿Quién desbaratará...

Dav Pilkey takes readers back in time to the carefree days of kindergarten, when the worst thing George and Harold had to face was NOT evil mad scientists or alien cafeteria ladies but a sixth-grade bully named Kipper Krupp, the nephew of their clueless school principal. And because George and Harold don't actually invent Captain Underpants until fourth grade, the two clever kindergartners are on their own -- using their brains to beat the bully....