Meet Ook and Gluk, the stars of this sensationally silly graphic novel from the creators of Captain Underpants! Tra-la-laaa! The wait is over! Dav Pilkey—ahem—we mean, George Beard and Harold Hutchins, the bestselling authors of 'The Adventures of Super Diaper Baby' (2002), are back with their second graphic novel! Ook and Gluk are the coolest caveboys to step out of the Stone Age! It's 500,001 BC, and Ook and Gluk's hometown of Caveland, Ohio, is under attack. The world's most evil corporation from the future has invaded the past, and the boys and their little dinosaur pal, Lily, are in big trouble! When a mysterious time portal takes them to the year 2222, they find a wise new friend. But will they find the secret to saving the day? Featuring Flip-O-Rama! Plus: Learn to speak caveman language! Fun! Easy! Annoys grown-ups! Edition MSRP: $9⁹⁹ US / $11⁹⁹ CAN (ISBN 978-0-545-17530-2) Printed in the United States of America