Grendizer: Getter Robo G - Great Mazinger Kessen! Daikaijuu  

グレンダイザー・ゲッターロボＧ・グレートマジンガー 決戦！大海獣, グレンダイザー・ゲッターロボＧ・グレートマジンガー 決戦！大海獣

A sea monster called "Dragonsaurus" has appeared suddenly and is causing fear in the ocean's depths. The teams of Great Mazinger, Grendizer, and Getter Robo G are working together to fight this new threat. However, their task becomes more challenging when Dragonsaurus swallows Boss Borot and heads towards Tokyo.