Doraemon: Nobita and the Knights on Dinosaurs (ドラえもん のび太と竜の騎士 Doraemon: Nobita to Ryū no Kishi) is the eighth installment of the Doraemon feature films.
A giant underground cave inspires Nobita to build a hideout, leading to the disappearance of Suneo and the discovery of a world overrun by dinosaurs.
Doraemon's Long Tales VOL.8 Noby and the Dino Knights
Noby and his friends decide to build a secret hideout in an underground cave. In the depths of the cave, Sneech comes across a shocking sight. Unable to believe his eyes, he returns the next day with a video camera in hand, only to lose his way after a surprise encounter with the RC plane he lost in the river. The rest of the gang return home, not knowing that Sneech is still in the cave. When they realize what they have done, it's too late: the "Anywhere Hole" is broken, and Sneech is trapped! Using Sneech's video camera as a clue, Noby and his friends discover a hole at the bottom of the river that leads to their secret cave. As they search for Sneech, they are led to a huge subterranean world where dinosaurs roam. Can Noby and the gang find their friend? The sensational eighth tale of the Doraemon's Long Tales series!
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.