In a world where three rival factions vie for control over Machine Island, a secluded prison-like land abundant in resources essential for crafting massive robots, a looming catastrophe threatens all life. As the island's power reactor teeters towards a catastrophic meltdown that could obliterate everything in 66 hours, the world government dispatches the mercenary duo Ken Kaido and Ryo Magami, alongside their formidable mecha Mazinkaiser, as the Death Caprice squad to avert the impending disaster. However, the question remains: will their intervention prove to be a wise decision with the fate of Earth hanging in the balance?