Retired samurai Kumosuke lives quietly, not to say idly, in Edo (old Tokyo) with his wife and two children, a young boy named Shinnosuke and an infant girl, Ohana. While he nominally runs a courier business to earn a living, he seems to spend most of his time smoking his pipe, drinking sake, and chasing women. The arrival of a Shinsengumi squad led by a young swordswman, Ichimonji Hyougo, disrupts this peaceful routine, forcing Kumosuke to defend himself.
After managing to survive attacks by Zeon's Char Aznable and Garma Zabi, the crew of Federation warship White Base and its mobile suits must battle Zeon forces through Asia, Europe, and the Atlantic Ocean if they are to reach Earth Federation's headquarters alive. During that process many of its crewmembers must overcome their fears, losses, immaturities, and insecurities in order to survive.
In the year Universal Century 0079, humans have colonized the area of space lying in between the Earth and the moon. However, the ambitious Zabi family, rulers of the Duchy of Zeon, the grouping of colonies furthest from the earth, has sparked a war.
When a UFO arrives from space and attacks the Getter Institute, Getter Robo is launched to stop it; but the might of the UFO and its giant space monsters prove to be too much for the Getter team. Not only is Getter Robo defeated, but Ouishan is killed in action! With Getter Robo out of commission, the world's only hope appears to be Great Mazinger, but the aliens' power might also be too much for even him. Can Dr. Saotome build a new Getter Robo in time to help save Great Mazinger, Japan, and the entire world?
When an UFO delivers a metal-eating monster to the heart of Japan, Getter Robo and Mazinger Z are launched to combat the alien menace. Fighting individually, the space monster's metal-eating and acid-spitting abilities prove too much for Japan's super robot forces - only their combined might stands a chance against defeating it! But with Mazinger Z damaged, can Getter Robo defend against the monster long enough for its comrade to be repaired? And even with forces combined, can they defeat the monster before all of Japan is destroyed?
