One day Nobita digs up a dinosaur egg, but when Doraemon is reluctant to believe that it is anything but a rock he decides to prove him wrong and uses the time cloth to return it to how it was one hundred million years ago. The egg hatches, revealing a baby Plesiosaur which Nobita names Piisuke and decides to raise. Soon enough the young dinosaur grows too big and is in danger of being discovered, so Nobita and Doraemon take him back to cretaceous era Japan. However, the time machine makes a mistake and they leave him in the Americas instead! Now Nobita and the others head back to the cretaceous era in an attempt to take Piisuke to where he should be. That is, if they can find a way home now that the time machine is broken, avoid the attacks of hungry dinosaurs, and elude the masked hunter who is determined to capture Piisuke at all costs!
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