Doraemon: Nobita's Great Battle of the Mermaid King (2010)

Nobita, Doraemon, and the rest must come to the aid of mermaid princess Sophia, whose undersea kingdom is suffering under the weight of a war. Their only hope lies in a mythical sword from the planet Aqua...

Director:

Kōzō Kusuba

Stars:

Wasabi Mizuta (Doraemon (voice)), Chiaki (Dorami (voice)), Megumi Oohara (Nobita (voice)), Tomokazu Seki (Suneo (voice)), Yumi Kakazu (Shizuka (voice)), Subaru Kimura (Gian (voice))