Mermaid princess Sophia appears in Nobita's yard. Visiting her underwater home, the gang joins a mer-tribe battle and searches for a mythical sword. Wasabi Mizuta, Tomokazu Seki, Fubito Yamano, Subaru Kimura, Rie Tanaka, Chiaki, Yumi Kakazu, Megumi Oohara, Mayumi Iizuka, Shihoko Hagino, Mayumi Izuka Added on HBO 2022-10-16.