Doraemon: Nobita and the Castle of the Undersea Devil

Nobita and his friends travel to the ocean depths to explore the underwater landscape. Using a specialized vehicle provided by Doraemon, the group navigates the sea, where they encounter various marine life and discover a hidden civilization of humans who have lived in secret for thousands of years. The journey involves conflict as characters attempt to locate a treasure ship, facing dangers when their protective equipment fails and they must rely on the help of sea creatures to survive.

Directed by Tsutomu Shibayama, this adventure film is the fifth of 25 movies he directed, following Two Down Full Base and preceding Doraemon: Nobita's Great Adventure in the World of Magic. The screenplay was written by Fujiko F. Fujio. The voice cast features Nobuyo Oyama, Noriko Ohara, Michiko Nomura, Kazuya Tatekabe, Kaneta Kimotsuki, and Michie Kita. Produced by Shin-Ei Animation, Shogakukan, and TV Asahi, the production involved a credited crew of 63 and a cast of 20.

The film earned 17 million USD at the worldwide box office. It has been received positively by viewers, holding a rating of 6.9/10 based on 752 votes on IMDb and a 7/10 rating from 36 votes on TMDB.