George and Harold are fourth-grade buddies with a penchant for practical jokes. When the boys' latest prank drives their science teacher over the edge, their clueless principal, Mr. Krupp, quickly hires a replacement: Professor Pippy P. Poopypants. Of course, George and Harold can't resist making fun of the Professor's silly name. But then the Professor retaliates by forcing everyone in town to change their own names to be equally silly, with colossal consequences!

DAV PILKEY is the creator of many acclaimed children's books, including Dogzilla, Kat Kong, god bless the gargoyles, and the bestselling Captain Underpants series. His book The Paperboy received a Caldecott Honor. He lives in the Pacific Northwest. www.pilkey.com

DAV PILKEY is the creator of many acclaimed children's books, including Dogzilla, Kat Kong, god bless the gargoyles, and the bestselling Captain Underpants series. His book The Paperboy received a Caldecott Honor. He lives in the Pacific Northwest. www.pilkey.com

DAV PILKEY is the creator of many acclaimed children's books, including Dogzilla, Kat Kong, god bless the gargoyles, and the bestselling Captain Underpants series. His book The Paperboy received a Caldecott Honor. He lives in the Pacific Northwest. www.pilkey.com

The critics are CRAZY about UNDERPANTS!

"Irresistible." -- Entertainment Weekly

"Call Pilkey... the savior of the 'reluctant reader.'" -- USA Today

"So appealing that youngsters won't notice that their vocabulary is stretching." --
School Library Journal

"Pilkey's sharp humor shines, and is as much fun for parents as their young readers."
-- Parents' Choice Foundation

"Combines empowerment and empathy with age-appropriate humor and action." --
Booklist

"Celebrates the triumph of the good-hearted." -- The Educational Book and Media
Association