"The Adventures of Captain Underpants" is a children's book series written by Dav Pilkey. The story follows two fourth-graders, George Beard and Harold Hutchins, who create a comic book superhero named Captain Underpants. When their principal, Mr. Krupp, accidentally gets hypnotized, he transforms into the superhero, fighting villains and saving the day while wearing only his underwear. The series is known for its humor, engaging illustrations, and playful storytelling. It encourages creativity and imagination, as George and Harold often find themselves in hilarious situations. The books have gained popularity among young readers and have been adapted into animated films and a television series.