From Beyond the Grave.In the past, the human race had fought a series of terrible battles on the Moon against a mysterious alien threat. Years later, like a phoenix from the ashes, the scientist discoverer of the Getter rays, Dr. Saotome, incredibly returns from the dead to seek revenge against those who use his discoveries for personal ambitions, and barricades himself in his base-fortress, the Saotome Laboratory. , protected by an entire army of Getter Robot G's at his service. The United Nations, when their forces are wiped out by Saotome's robots, turns to two ambiguous scientists, Cowen and Stinger, for help. And ironically, to face Saotome the only person who is believed to be able to face the army of Getter Robots is called back into service: Ryoma Nagare, first pilot of the Getter team, and for years in prison because he was considered guilty of the murder of the Dr. Saotome. On board a Getter-1, Ryoma faces the myriad of Getter Robot Gs who in the middle of the battle break down into the Getter Machines, to recompose themselves into a single great entity: the Shin Getter Dragon. Meanwhile, the alien invaders, who believed themselves defeated, return to attack humanity, showing themselves particularly interested in a mysterious capsule of Saotome, containing a human body.