Doraemon: Nobita's Dinosaur
is a 1980 Japanese animated science fiction adventure film based on the manga series Doraemon, particularly the first volume of the same name of the Doraemon Long Stories series. The film premiered on 15 March 1980 in Japan. It's the first feature-length Doraemon film. Plot Suneo shows a fossil of a dinosaur claw to everyone except Nobita. Being angry, Nobita claims he will be able to find a living dinosaur. As Doraemon refuses to help him, he digs on a hillside, but instead earns punishment from a landlord nearby who forces him to unearth a hole in the ground. He finds an egg-shaped stone underneath and quickly uses a time wrap to return it to its former form, and after warming it, the egg hatches to reveal a plesiosaur (Futabasaurus), who is subsequently named Piisuke by Nobita. Instead of immediately showing it to the others, Nobita waits for it to grow while making a deal with others. However, as Piisuke grows too large, Nobita and Doraemon hide him in the nearby lake. Worried about the risk of Piisuke being found and overwhelmed in having to take care of the dinosaur, Doraemon and Nobita transport him to 100 million years ago