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 toward Tokyo.
Synonyms: グレンダイザー・ゲッターロボＧ・グレートマジンガー 決戦！大海獣
Status: Finished Airing
Country: Japanese
Released: 1976
Season: Movie
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