Harry thinks he's too old for his bucketful of dinosaurs but they think he's wrong! Harry looked after his dinosaurs when he was little and now they want to stick by him - forever ...When a mysteryious set of plastic dinosaur cards appears on his key-ring, Harry discovers he can call on an army of Back-Up Dinosaurs. Just a rub with his finger calls up some MONSTER-sized muscle! In this adventure, Harry and his friends are kayaking when they discover someone is stealing rare birds' eggs. But there's a SURPRISE in store for the thief!