It's the first day at school for Harry and his Bucketful of Dinosaurs and they're excited to be going – all except Stegosaurus, who's very nervous. Then, when they get to school, Harry and his Bucket get separated and Harry's not so sure he's going to like school after all. Harry soon sees another boy who's very unhappy and decides to try and cheer him up – with the help of his dinosaurs, of course, and before long everyone is enjoying their first day as well as making brand new friends.