Based upon the original "Getter Robo" and "Getter Robo G" series. The Getter Robos were created during the lunar wars in an effort to defend the Earth against the seemingly endless threat of alien invasion. 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. 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!