The series revolves around an earless robotic cat named Doraemon, who travels back in time from the 22nd century to aid a boy named Nobita Nobi.
Nobita hatches an egg of Futabasaurus that is a genus of Plesiosaurs flourishing during the Cretaceous in Japan, named it "Piisuke". As Nobita, with getting a help of Doraemon and three friends, tries ...
Nobita accidentally finds a fossil dinosaur egg mixed with rocks in the dinosaur fossil exhibition site that he had visited before. He returns it to its original state with the 'time blanket'.