The Adventures of Ook and Gluk: Kung-Fu Cavemen from the Future...
wikipedia - 30 Mar 2021The Adventures of Ook and Gluk: Kung-Fu Cavemen from the Future is a graphic novel by Dav Pilkey[1] and a second spin-off of Captain Underpants. Pilkey uses "George Beard" as the author and "Harold Hutchins" as the illustrator. These are the names of his characters in the Captain Underpants books.