The Captain Underpants Extra-Crunchy Book o' Fun Go to amazon.com Related posts The 16 best underpants books for 2022 FeatureGreat product! DescriptionGeorge, Harold, Captain Underpants, and a cast of bad guys jump from the pages in a lively activity book filled with puzzles, games, comics, drawing tips, Flip-o-Rama pages, and more. Original.