For use in schools and libraries only. Ricky and his Mighty Robot meet a mean little Martian named Major Monkey who plans to take over Earth with his monstrous

Tra-la-laaa! Dav Pilkey -- ahem -- we mean, George and Harold, the authors of SUPER DIAPER BABY, are back with their second epic novel! Meet Ook and Gluk, the s

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

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 and Harold have to figure out how to fix history in the tenth book in this #1 New York Times bestselling series by Dav Pilkey, the author and illustrator