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
Ishimaru Hiroya
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This is the first movie where Grendizer appears on the big screen! And what a title to attract the audience. Who would've ever thought of seeing Grendizer fighting Great Mazinger. Well guess what? That title is misleading, because it wasn't really a fight, otherwise Grendizer would rip Great Mazinger apart.
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