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

A formidable sea creature, Dragonsaurus, suddenly rises from the ocean's depths, wreaking havoc in its wake. To confront this terrifying new adversary, the heroes of Great Mazinger, Grendizer, and Getter Robo G unite their powers. However, the situation escalates when Dragonsaurus devours Boss Borot and heads straight for Tokyo, complicating their mission. The stakes are higher than ever as the team must race against time to save the city from imminent destruction.