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.

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

Having changed the course of human history after unwittingly wondering what could be worse than going to prison, George and Harold are shot through time back to kindergarten, where they are subjected to bullying and a clueless school principal.

"Big bad Mr. Bundy? Mr. Bundy is the principal at PS 88. And it may be hard to believe, but he once came nose-to-nose with the big bad wolf, who gobbled him up in one bite! "Gulp!" One thing all the kids at PS 88 know for sure is that their favorite principal is never far from zany (mis)adventures"--Jacket.

Pinkalicious gets to be Principal for a Day because she has perfect attendance! Pinkalicious can't wait to be in charge, but when she wakes up sick on the big day, will her dreams of being Principal Pinkalicious be -- ACHOO! -- blown away?

Anne Shirley has left college behind to begin a new job. Now she faces a new challenge, the Pringles. Known as the royal family of Summerside, they quickly let Anne know that she is not the person they ahd wanted as principal of Summerside High School.

When the teachers of Ella Mentry School go on strike, A. J. and the gang meet a new principal who does not believe in rules and says that the students do not have to learn anything if they do not want to.

Professor Pippy P. Poopypants takes over science class at Jerome Horwitz Elementary in the fourth book in this #1 New York Times bestselling series by Dav Pilkey, the author and illustrator of Dog Man!

George and Harold are fourth-grade buddies with a penchant for practical jokes. When the boys' latest prank drives their science teacher over the edge, their clueless principal, Mr. Krupp, quickly hires a replacement: Professor Pippy P....

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

The Notebook of Doom is missing and Alexander and his fellow-monster hunters, Rip and Nikki, are convinced that the boss-monster has it; but is that monster the mysterious Principal Vanderpants, who is certainly behaving oddly, or someone else--and they need to figure that out quickly because a mistake could have deadly consequences for Stermont Elementary.