From Dav Pilkey, creator of Captain Underpants, and acclaimed artist Dan Santat, an out-of-this-world friendship adventure with all-new full-color illustrations!

Meet Ricky Ricotta, a little mouse with a big problem!Ricky Ricotta lives in Squeakyville with his mom and dad. Ricky has a hard time making friends at school, and the neighborhood bullies are always picking on him. If only Ricky could find someone to be his best buddy and keep those...

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.

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.

Prince Liam. Prince Frederick. Prince Duncan. Prince Gustav. You've never heard of them, but you've probably heard of Prince Charming, the guy who rides in at the last minute to save the girl. Well that's them, all four of them. They are all Prince Charmings. Only in reality, they are a little less heroic than you might expect. When Prince Liam is kidnapped and forced to marry the evil Briar Rose, they must unite again to save him. But can they really...

Arthur Penhaligon is supposed to die at a young age, but is saved by a key that is shaped like the minute hand of a clock. The key causes bizarre creatures to come from another realm, bringing with them a plague. A man named Mister Monday will stop at nothing to get the key back. Arthur goes to a mysterious house that only he can see, so that he can learn the truth about himself and the key.

"George and Harold have really done it this time--they've created a monster! She's faster, smarter, and more evil than anything the world has seen before--she's Wedgie Woman! With the help of her horrible robots and her horrendous hairdo, Wedgie Woman is on a mission to take over the world, and she'll give a whopping wedgie to anyone who stands in her way--including Captain Underpants."--P. [4] of cover.

A small mouse and his best friend, a giant flying robot, attempt to save the Earth when an evil Martian monkey and his mechanical creations attack.

George, Harold, Captain Underpants, and Sulu the bionic hamster battle the three ridiculous Robo-Boogers in an attempt to turn the Bionic Booger Boy back into Melvin Sneedly. George and Harold blasted the Bionic Booger Boy back into brainiac Melvin Sneedly and thought their fears of phlegm were behind them. But they forgot about the rotten Robo-Boogers! In an epic adventure that spans space and time, only Captain Underpants can mop away these mucus...

Infuriated by the declaration that Pluto is no longer a planet, President Penguin and his penguins invade Earth and it is up to Ricky and his robot pal to defeat them--with some help from Ricky's cousin Lucy and her pets.