Doraemon: Nobita and the Knights of Dinosaurs (1987)
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About Doraemon: Nobita and the Knights of Dinosaurs
Nobita and Doraemon were finding out the truth about a real dinosaur. Nobita saw something under the ocean when they come across a cave that leads to an underground world full of dino-people. Nobita and his friends are amazed by their new discovery but sadly their memories must be wiped and must return to earth.