John Wesley Powell always had the spirit of adventure in him. As a young man, he traveled all over the United States exploring. When the Civil War began, Powell went to fight for the Union, and even after he lost most of his right arm, he continued to fight until the war was over. In 1869, he embarked with the Colorado River Exploring Expedition-- ten men in four boats-- to float through the Grand Canyon. Ten explorers went in, but only six came out....

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.

Starting a new school is scary, even more so with a giant hearing aid strapped to your chest. At her old school, everyone in Cece's class was deaf. Here she is different. She is sure the kids are staring at the Phonic Ear, the powerful aid that will help her hear her teacher. Too bad it also seems certain to repel potential friends. Then Cece makes a startling discovery. With the Phonic Ear she can hear her teacher not just in the classroom, but anywhere...

Buzz creates a comic book that features Buzz Boy and Fly Guy as the superheroes.

Babymouse doesn't exactly have a great history with pets--even her goldfish ran away from home. But all that's about to change. Will Babymouse get the dog of her dreams? Will she ever find her missing fish?

"The Bad Guys have entered a whole new world--like, literally--a VERY nasty new universe awaits. Oh, Mr. Snake, what have you done ...?"--Provided by publisher

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.

"Pop quiz! You are on the roof of a skyscraper. Every floor of that building has nasty things that just don't like you. And you really need to get to the basement. Whaddaya do?! (And no, you can't just join the B-Team and fly away in their glamorous new spaceship.) Think quick, chico, because the multiverse is getting worse!"--Provided by publisher.

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.

When a new bunch of baddies bust up the town, Dog Man is called into action -- and this time he isn't alone. With a cute kitten and a remarkable robot by his side, our heroes must save the day by joining forces with an unlikely ally: Petey, the World's Most Evil Cat. But can the villainous Petey avoid vengeance and venture into virtue?