Sent to jail after being accused of murdering Dr. Saotome, creator of Getter Robo, Ryoma Nagare must re-team with his former comrades and Getter Robo pilot when Saotome returns from the dead and threatens humanity by unleashing his greatest power. creation: the Shin Dragon. However, his efforts are in vain, as they fail to stop a nuclear warhead from hitting Shin Dragon, resulting in a massive Getter Ray contamination that wipes out 99% of the planet's population. Thirteen years after this great catastrophe, humanity continues to fight for survival against the invaders. From the wreckage of the nuclear explosion emerges the Shin Getter, piloted by the artificial human Go. With remnants of the Japanese army at his side, Go, along with co-pilots Kei and Gai, must use the Shin Getter to exterminate the invaders once and for all.