Grendizer: Getter Robo G - Great Mazinger Kessen! Daikaijuu

Synopsis

From the depths of the ocean, a colossal sea monster dubbed Dragonsaurus suddenly emerges and begins terrorizing the seas. Great Mazinger, Grendizer, and the Getter Robo G team unite to take on this new threat. However, their mission grows even more complicated when Dragonsaurus swallows Boss Borot and heads straight for Tokyo.