宇宙人の子孫が祖先の宇宙船やロボットを発掘し、地球を征服しようとする祖先の敵でもあった宇宙人と戦うのが 本作・無敵超人ザンボット3です。

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The descendants of aliens excavate their ancestors' spaceships and robots, then battle the aliens who were their ancestors' enemies as they attempt to conquer Earth. This is the story of Invincible Super Man Zambot 3.