UFO Robot Grendizer vs. Great Mazinger

An alien empire seizes one of Earth's robot guardians, Great Mazinger, and turns it against humanity, but Duke Fleed sends his own robot, Grendizer, to stop Great Mazinger.
An alien empire seizes one of Earth's robot guardians, Great Mazinger, and turns it against humanity, but Duke Fleed sends his own robot, Grendizer, to stop Great Mazinger.

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UFO Robot Grendizer vs. Great Mazinger (Short 1976) - IMDb

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UFO Robot Grendizer vs. Great Mazinger

Dynamic Heroes (Great Mazinger, Devilman and UFO Robot Grendizer) by Kazuhiro Ochi