With more than 80 million copies of "Captain Underpants" books in print worldwide, there's a good chance one or more of the graphic novels are sitting on your kids' bookshelves right now.

Scholastic first launched the Captain Underpants book series in September of 1997 and there are over 50 million Pilkey books in print in the U.S. alone. Eight Captain Underpants books have been ...