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
Casts: Hiroya Ishimaru, Akira Kamiya, Minori Matsushima
Director: Masayuki Akehi
Countrys: Japan
Watch Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster
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| Score | Rating Count | Release Date | RunTime |
|---|---|---|---|
| 7.1 | 230 | 1976-07-18 | 31 |