From deep within the Earth's surface, the Dinosaur Kingdom make their move to wipe out mankind and conquer the planet with their mechanical dinosaurs. After a prototype Getter Robo is shot down by a mechanical dinosaur, the Saotome Research Institute decides to use the real Getter Robo, which is combat-capable. Due to a lack of pilots in the institute, Ryo Nagare goes to his college to persuade martial artist Musashi Tomoe and outcast Hayato Jin to him and pilot the Getter Machines to combat the new threat and protect mankind.

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