May 01, 2011 ยท Book Trailer. The Adventures of Ook and Gluk: Kung-Fu Cavemen from the Future is a graphic novel by Dav Pilkey 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.The plot of the book includes George .... "/>The adventures of ook and gluk kung-fu