Harry thinks he's too old for his bucketful of dinosaurs but they think he's wrong! When a mysterious set of plastic dinosaur cards appear on his key-ring, Harry discovers he can call on an army of Back-Up Dinosaurs for some MONSTER-sized muscle! Harry and his friends are having a kayaking adventure! But when they discover someone is stealing rare birds' eggs, Harry is determined to help. There's a MONSTER SURPRISE in store for the thief! Join Harry and friends for their latest colossal adventure...