在地狱博士意图征服世界的野心被击溃后，却有股潜伏于地底的新势力趁虚而起，那就是正打着坐收渔翁之利算盘的“迈锡尼帝国”，开始以“战斗兽”大肆挥军攻向地面。仍还浸溺于和平之中的光子力研究所遭遇到了另一场空前未有的新危机，甲儿乘坐着建造研发的大魔神划过夕阳从天而降，轻而易举地将来犯敌军通通一扫而空。
大魔神 (季节 0)
Great Mazinger Vs. Getter Robo 0.0
播出日期: 1975-03-21
概述: When a UFO appears over Japan, both the heroes of Great Mazinger and Getter Robo want to investigate it first, out of a sense of rivalry. Getter finds it first since the Mazinger robot is being repaired. However they are unable to defeat the apparently living vehicle. It had already dropped a metal-eating monster on Japan named Gilgilgan and Great Mazinger confronts it only to be badly beaten. Later, despite the robot pilots' protests, their two bases decide to join forces to stop Gilgilgan as he starts becoming more powerful and begins to change. They make a plan to lure it to an empty island where they can battle it without causing collateral damage. They get Boss to lure the monster there where it eats Boss Borot in the process. The combined heroes almost defeat Gilgilgan until the UFO returns and allows itself to be eaten to cause its own creation to grow to its final form. During the intense battle the heroes manage to find its weak points and destroy Gilgilgan. Afterward they promise to be friends from then on.
Great Mazinger Vs. Getter Robot G: The Great Clash in the Sky 0.0
播出日期: 1975-07-26
概述: Theatrical feature. Great Mazinger and Getter Robo G battle the Mysterious Invaders for the fate of the earth!
UFO Robot Grendizer vs. Great Mazinger 0.0
播出日期: 1976-03-20
概述: Theatrical feature. When the Vegan empire dispatches a new general to oversee the takeover of Earth, he quickly manages to capture Koji Kabuto and, learning of Great Mazinger through interrogation, quickly comandeers it from a museum where it was kept as a symbol of peace. It is now up to Duke Fleed and Grendizer to stop humanity's former defender from becoming its destroyer.
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! Great Sea Beast 0.0
播出日期: 1976-07-18
概述: A giant sea monster known as "Dragonsaurus" has emerged from out of nowhere, terrorizing the depths of the oceans. Great Mazinger, Grendizer and the Getter Robo G team join forces to combat the new threat. But their task becomes more complicated when Dragonsaurus swallows up Boss Borot and makes its way towards Tokyo.
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集 56
集 4