Dr. Hell a brilliant biochemist with a penchant for alchemy had met with esteemed roboticist Dr. Juzo Kabuto for an expedition on the Greek Island of Bardos. On there, the pair discovered ancient biotechnological beings that Dr. Hell wishes to make use of for his plans of a new world order. Juzo refused, narrowly escaping Dr. Hell's own cyborg prototypes. To combat Hell, Dr. Kabuto began his lifelong project the Mazinger Z, leaving the battle up to his grandson Koji.