“The Adventures of Captain Underpants” is a children's book series written by 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 school principal, Mr. Krupp, is hypnotized, he transforms into Captain Underpants, who fights villains in his underwear. The series is known for its humor, creativity, and engaging illustrations. It encourages children to read and enjoy storytelling through its playful narrative and comic-style format. The books have gained popularity and have been adapted into animated films and a television series.