Books like the adventures of ook and gluk, kung-fu cavemen from the future

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 involves George and Harold, the lead characters from Pilkey's Captain Underpants series, complaining that scientists don't know everything, so they make a comic book about science facts.

The book begins with a scientific disclaimer by professor Gaylord M. Sneedly, saying that the book "contains many scientific errors and stuff." He stated that dinosaurs and cavemen did not live at the same time, as dinosaurs lived 64 million years before cavemen. He then stated that he should know about it, since he was a recipient of "The Most Brilliantest Science Guy of the Whole Wide World Award" in 2003, a reference to the seventh Captain Underpants book.