Captain Underpants is a popular children's book series created by author Dav Pilkey. The story follows two fourth-grade boys, George Beard and Harold Hutchins, who create a comic book superhero named Captain Underpants. When their principal, Mr. Krupp, is accidentally hypnotized, he transforms into the superhero, fighting villains and saving the day while wearing only his underwear and a cape. The series is known for its humor, engaging illustrations, and unique storytelling style, which includes comic strips and flip-o-rama pages. Captain Underpants encourages creativity and imagination, making it a favorite among young readers and promoting a love for reading.