Grendizer: Getter Robo G - Great Mazinger Kessen! Daikaijuu

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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: Anime News Network)
Anitummy is a site to watch online anime like Grendizer: Getter Robo G - Great Mazinger Kessen! Daikaijuu online, or you can even watch Grendizer: Getter Robo G - Great Mazinger Kessen! Daikaijuu in HD quality
Overview:
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: Anime News Network)
Other names: Great Mazinger Decisive Battle! The Great Sea Monster,L'attaque du Dragosaure
Aired: July 18, 1976 to July 18, 1976
Episodes: 1
Premiered: SUMMER
Duration: 31m
Status: Completed
Genres: AdventureMecha
Anitummy is a site to watch online anime like Grendizer: Getter Robo G - Great Mazinger Kessen! Daikaijuu online, or you can even watch Grendizer: Getter Robo G - Great Mazinger Kessen! Daikaijuu in HD quality