: The fun is cut short when a parasitic alien race called the Yadori begins possessing robots and humans to take over the galaxy.

The story kicks off with a classic Doraemon setup: Nobita is feeling left out. Suneo has invited everyone to a fancy express train ride, leaving Nobita behind. Seeking consolation, Nobita discovers that Doraemon has secured tickets for a mysterious, high-tech train—the .

Their vacation is interrupted when parasitic aliens known as the Yadori attempt to take over humans as hosts.

The alien threat adds a significant layer of suspense, making it one of the more thrilling movies in the series.