Doraemon: Nobita's Dinosaur

Nobita digs up a dinosaur fossil near his home and uses the Time Cloth to restore it, hatching a baby Plesiosaur named Pi-su. Pi-su becomes Nobita's best friend, but as he grows too large and is discovered by humans, they decide to return him to the age of dinosaurs. However, they mistakenly send him back to prehistoric North America. Nobita and his friends travel back to the dinosaur era using the time machine, but are pursued by a mysterious figure intent on stealing Pi-su, causing their time machine to malfunction. They must find their own way back to Japan across ancient landmasses. After a long adventure, the mysterious figure reappears, revealing himself to be an illegal dinosaur hunter from the future who wants to capture Pi-su for profit. He demands that Nobita and his friends hand over Pi-su in exchange for being sent home with the time machine. Nobita decides to steal the time machine instead, but during the attempt, Shizuka, Suneo, and Gian are captured. Doraemon and Nobita rush to rescue them but fall into a trap, finding themselves in a dinosaur arena within the hunter's base. The hunter releases a dinosaur to attack them. Just as they seem doomed to be eaten, the dinosaur turns out to have previously eaten Doraemon's special dumplings, making it obedient. With the dinosaur's help, they turn the tide, and the arriving Time Patrol defeats the dinosaur hunter. Finally, with the assistance of the Time Patrol, Pi-su is returned to his homeland, and everyone goes back to the present world.