Harry thinks he's too old for his bucketful of dinosaurs but they think
he's wrong! He looked after them when he was little and now they want to
stick by him - forever . . . 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. Just a rub with his finger calls up some
MONSTER-sized muscle! Dangerous dogs are worrying sheep near where Harry
lives. He calls on Charlie, Siri and Jack to help investigate. But it's
going to take a rather special FLYING friend to save the day!