The Romans and Dinosaurs live on Mars in a huge glass dome called Romasauria. They race their rocket chariots and feast on Moon-Cow and chips until life on Mars is threatened by a Giant Asteroid. Will a wooden catapault and some dinosaur poo save the day? That's up to you...

This book needs YOU! Finish the illustrations and colour them in while you read and enjoy a proper story with lots and lots of laughs!

Other titles in this hilarious series include: Pirates v Ancient Egyptians in a Haunted Museum; Secret Agents v Giant Slugs in the Jungle; Aliens v Mad Scientists Under the Ocean; Cowboys v Trolls in the Arctic; Robots v Gorillas in the Desert.