12 books · Ages 7–11 · Middle Grade, Graphic Novels, Chapter Books
The series that proved bathroom humor could be a gateway to literacy. George and Harold are the kind of kids teachers dread and children adore, and the books reward their mischief with a world where creativity and rule-breaking actually save the day. Twelve books plus three spinoffs, and the flip-o-rama pages remain one of the most inspired interactive elements in children's publishing.

Start at the beginning: The Adventures of Captain Underpants
This is a sequential series — each book builds on the last. Start with book 1.
