Harry thinks he's too old for his bucketful of dinosaurs, but they have other ideas. He looked after them when he was little and now they're determined to stick by him . . . for life. And Harry is not the only one who's got a lot bigger When a mysterious set of plastic dinosaur cards appear on his key-ring, Harry soon finds that he can call on an army of Back-Up Dinosaurs. It only takes a rub with his finger to call up some MONSTER-sized muscle ...