In mankind's darkest hour, the Getter Robos arrived on the cold lunar battlefield and saved mankind from its impending demise at the hands of the ruthless alien invaders. As the years passed, the weapons that once saved mankind became an element of fear that drove humanity to destroy their protectors and the man responsible for their creation.

Now like a phoenix rising from the ashes, the man behind the Getter Robos has returned from the dead with an army of Getter Robo G's bent on seeking revenge against those who would use the Getter technology for their own evil purposes. As nuclear annihilation and alien invasion loom on the horizon, old heroes as well as new ones must heed the call to battle as the war for Earth's survival begins anew!