Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster

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

Also known as Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! Great Sea Beast, Goldorak, L'attaque du dragonosaure, Grendizer: Getter Robo G - Great Mazinger Kessen! Daikaijuu, Mazinga contro gli UFO Robot, Grendizer, Getter Robo G, Great Mazinger: Kessen! Daikaijuu!

A giant sea monster known as Dragonsaurus has emerged from out of nowhere, terrorizing the depths of the oceans. Great Mazinger, Grendizer and the Getter Robo G team join forces to combat the new threat. But their task becomes more complicated when Dragonsaurus swallows up Boss Borot and makes its way towards Tokyo. Source: ANN