Nobita, believing he and Doraemon had done a good deed by saving stray cats and dogs and sending them back in time by 300 million years, discover that the usage of Doraemon's Ray of Evolution had created a cat-and-dog-person society equal to Nobita's time. When an asteroid attack is set to hit the city, Nobita and his friends must save Doraemon and ease tensions between the two sides.

Directed by Tsutomu Shibayama