Kouji and his comrades have vanquished Dr. Hell, enjoying a respite; yet an odd seer suddenly arrives to caution everyone of impending peril, as unseen mechanical beasts erupt worldwide, causing devastation. It falls on Kouji and his Mazinger Z to confront this menace, though he appears overwhelmingly outnumbered and outmatched in a swirl of fire while ever the world trembles beneath their assault.
This film acts as a bridge linking the Mazinger Z series with Great Mazinger, presenting the latter and its foes from the Mikene Empire to viewers. It highlights their clashes across the skies, captivating audiences with heroic valor.
Toei Animation Japan