Doraemon: Nobita's Great Battle of the Mermaid King

Nobita wants to go diving in his own city, leading Doraemon to use gadgets that simulate an underwater environment. During this experience, they encounter Sophia, a mermaid princess from an ancient civilization. Doraemon and his friends travel to an undersea kingdom where they become involved in a long-standing conflict between the mermaids and a rival group. To bring peace to the oceans and help the mermaids potentially return to their home planet, the group searches for a mythical sword and armor.

Directed by Kōzō Kusuba, this film follows his previous work, Marco: Carry a Dream, and precedes Doraemon: Nobita and the Island of Miracles – Animal Adventure. The voice cast features Wasabi Mizuta, Megumi Oohara, Chiaki, Tomokazu Seki, Yumi Kakazu, and Subaru Kimura. Produced in Japan by companies including Shin-Ei Animation and Fujiko Productions, the movie has a runtime of 100 minutes.

The film earned 35 million USD at the worldwide box office. It is generally well received by viewers, holding a 6.5 rating on IMDb from 943 votes and a 6.8 rating on TMDB based on 74 votes.