Two hour movie compilation of the english version of Getter Robo, Starvengers. After the final defeat of the Dinosaur Empire and the death of Musashi Tomoe in the original Getter Robo series. Dr. Copernicus, creator of Getter Robo, fears that the peace the Getter Robo team has won will be short lived and that even greater enemies will appear. Dr. Copernicus's fears are justified when the Pandemonium Empire appears. Composed of horned, devil-like humanoids, and possessing a technology advanced enough to build giant demonic robots, this militaristic organization intends to steal Copernicus's Omnicron Generator to fulfill their own goals of world domination. But Dr. Copernicus is prepared with the creation of an even more powerful Getter Robo, the Starvenger Robot and a new base. Also, with Musashi dead, Dr. Copernicus needs a third pilot which he finds in baseball player Foul Tip.

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.