Doraemon: Nobita's Dinosaur

After boasting to his friends, Nobita discovers a dinosaur egg and hatches a young plesiosaur he names Pisuke, raising it in secret with Doraemon's help until it grows too large to hide. When illegal dinosaur hunters come after Pisuke, Nobita and friends use Doraemon's gadgets to travel back to the Cretaceous period to return him safely to his own time. The very first Doraemon theatrical film, this adventure set the template for the beloved movie franchise.