A giant sea monster known as Dragonsaurus has emerged from out of nowhere, terrorizing the depths of the oceans. Great Mazinger, Grendizer and the Getter Robo G team join forces to combat the new threat. But their task becomes more complicated when Dragonsaurus swallows up Boss Borot and makes its way towards Tokyo. Source: ANN
Directed by Masayuki Akehi
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TrailerGrendizer, Getter Robo G, Great Mazinger: Decisive Battle! Great Sea Beast (1976) - Trailer
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