With her perfect attendance record, Pinkalicious gets to be principal for the day, but when she wakes up sick, she worries that her big day will be ruined.

Tired of following the strict rules of their grumpy replacement principal, second-grader A.J. and his classmates try to find a way to bring back eccentric but lovable Principal Klutz, who was fired for bringing a wild turkey to the school's Thanksgiving Day assembly.

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.

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.

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.

"Melville Heights is one of the nicest neighborhoods in Bristol, England; home to doctors and lawyers and old-money academics. It's not the sort of place where people are brutally murdered in their own kitchens. But it is the sort of place where everyone has a secret. And everyone is watching you. As the headmaster credited with turning around the local school, Tom Fitzwilliam is beloved by one and all--including Joey Mullen, his new neighbor, who...

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.

"Samantha Casey loves everything about her job as an elementary school librarian on the sunny, historic island of Galveston, Texas-the goofy kids, the stately Victorian building, the butterfly garden. But when the school suddenly loses its beloved principal, it turns out his replacement will be none other than Duncan Carpenter-a former, unrequited crush of Sam's from many years before. When Duncan shows up as her new boss, though, he's nothing like...

Only Captain Underpants can stop the three evil space aliens who have invaded Jerome Horwitz Elementary School and turned everyone into lunchroom zombie nerds.