Doraemon The Movie: Nobita's Great Battle of the Mermaid King (映画ドラえもん のび太の人魚大海戦, Eiga Doraemon Nobita no Ningyo Daikaisen?), also known as DORAEMON THE LEGEND 2010, is a 2010 Japanese animated film that was released on March 6, 2010. This movie is part of the celebration for the franchise's 40th anniversary and it's 30th movie anniversary (映画ドラえもん30周年?).[1][2]

When Nobita feels like diving in his hometown, Doraemon uses Underwater Pump Simulator (架空水面シミュレーター・ポンプ?) to pump all the water to fill up water. That night, Doraemon and Nobita use a Diving Mask Simulator to dive underwater. Later on, lots of fish, and a shark attack Doraemon and his friends. So, Doraemon puts a stop on the Underwater Pump Simulator, but there is a girl named Sophia, lay down on the bushes in his town.