In a futuristic world, humanity embarks on an energy revolution with the discovery of Photon Power, a potent source found beneath Mt. Fuji. Dr. Hell, a power-hungry villain, covets this energy for global domination. To thwart his plans, teenager Kabuto Kouji pilots the legendary robot Mazinger Z against a horde of mechanical beasts from ancient Greece. As the battle unfolds, mysteries of the Mycenaean Civilization, Bardos Island, and Mazinger Z's origins unfurl, leading to a fresh narrative in Shin Mazinger Shougeki! Z-Hen, a reimagined tale untethered from its predecessor.