From deep within the Earth's surface, the Dinosaur Kingdom launches an offensive to wipe out mankind and conquer the planet using their mechanical dinosaurs. After a prototype Getter Robo is shot down by a mechanical dinosaur, the Saotome Research Institute decides to deploy the actual Getter Robo, which is combat-capable. Due to a shortage of pilots at the institute, Ryo Nagare goes to his college to persuade martial artist Musashi Tomoe and outcast Hayato Jin to join him and pilot the Getter Machines to combat the new threat and protect mankind.