Doraemon and his friends travel to ancient Japan where they meet Kukuru. When Kukuru tells them that his tribe has been enslaved by Gigazombie, Doraemon decides to help him.
Doraemon: Nobita's Great Adventure in the Antarctic Kachi Kochi
Doraemon: Nobita and the Green Giant Legend
Night of the Animated Dead
Doraemon: Nobita's Dinosaur