* Based on the Mazinger series by Nagai Gou.

At some point in the future, an army of machines, led by Baron Ashura, defeats Kabuto Kouji 's Mazinger Z and Tsurugi Tetsuya's Great Mazinger. In the aftermath, Kouji stumbles upon a forgotten laboratory. Inside, he finds Mazinkaiser, the most powerful robot ever built. The series chronicles Kouji's experience with the machine as he copes with Kaiser's power while defeating Dr. Hell's forces.

Source: Wikipedia

Note: The Mazinkaiser robot was originally created for Banpresto's Super Robot Wars game series and subsequently appeared in anime and manga.

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Alternative setting: Mazinger Z
Sequel: Mazinkaiser: Shitou! Ankoku Daishougun
Other: Mazinkaizer SKL