The first episode begins in medias res, depicting the climatic final battle between the Photon Power Lab and Dr. Hell's forces. Meeting the attack head on are the Mazinger Corps and the Kurogane house, who attempt to stand their ground against Dr. Hell's three armies, led by Baron Ashura, Count Brocken and Viscount Pygman. As the battle is being waged we find out that the protagonist Kouji has been missing, and is shown to be in an unknown location, for unknown reasons. While there he meets a variety of strange beings including Zeus. By the time he returns, Dr. Hell's forces have already defeated most of his comrades and Kouji prepares to defeat Dr. Hell, for their sake.
世界征服を阻む光子力研究所にDr.ヘルの総攻撃が始まった。迎え撃つはマジンガー軍団。出撃せよ、マジンガーZ!
En el fragor de la batalla final, Koji Kabuto ( a bordo de Mazinger Z) junto a sus aliados, pelea sin cuartel contra las fuerzas del mal comandadas por el Dr. Infierno.
El poder de Mazinger queda presente en todo momento como el de un DIos, si el camino escogido es hacer el bien, o por el contrario como el de un demonio si se usa para hacer el mal.
如果有一天你取得了能够匹敌神或恶魔的力量你会怎么使用它？成为保护世界的英雄吗？还是成为毁灭世界的恶魔？有一天少年兜甲儿获得了这种力量——魔神Z的力量…… 经过漫长的战斗甲儿终于见到了最强的敌人黑暗大将军，不理会地狱博士的嘲笑发出胜利宣言的甲儿将魔神Z变形为真魔神飞拳冲向他最后的敌人……
