Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster
1976, Japanese. Directed by Masayuki Akehi.
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
- Runtime
- 0h 31m
- Post-credits
- None listed
- Language
- Japanese
- Rated
- Check local
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Where to watch Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster isn’t streaming on any OTT platform in India yet; it released on 18 July 1976.
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Part of a series
Dynamic Pro Super Robot: watch order
Cast & crew
Details
- Released
- 18 July 1976
- Original title
- 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
- Country
- Japan
- Written by
- Susumu Takaku
Check ratings elsewhere
News & fan talk
Watch before Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster
In release order. The films it follows, and anything it builds on.
Mazinger Z vs. Devilman
1973 · 5.6/10
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Mazinger Z vs. Doctor Hell
1974 · 8.0/10
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Mazinger Z vs The Great Dark General
1974 · 8.2/10
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Getter Robo
1974 · 7.0/10
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That's a UFO! The Flying Saucer
1975 · 5.2/10
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Great Mazinger vs. Getter Robo
1975 · 5.8/10
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Great Mazinger vs. Getter Robo G: The Great Space Encounter
1975 · 7.7/10
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Battlefield of the Space Saucers
1975 · 6.3/10
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UFO Robot Grendizer Theatrical Version
1975 · 7.0/10
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UFO Robot Grendizer vs. Great Mazinger
1976 · 5.8/10
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Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster: quick answers
What should I watch before Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster?
Watch Great Mazinger vs. Getter Robo G: The Great Space Encounter (1975), Battlefield of the Space Saucers (1975), UFO Robot Grendizer Theatrical Version (1975), and UFO Robot Grendizer vs. Great Mazinger (1976) first, plus 6 earlier titles listed on this page.
What comes after Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster?
Next in the series: Shin Getter Robo vs Neo Getter Robo (2000), Mazinkaiser vs Great Darkness General (2003), and Mazinkaizer SKL (2010).
Is Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster worth watching?
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster doesn’t have enough ratings for a verdict yet.
How long is Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster?
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster runs 31 minutes (0h 31m).
Does Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster have a post-credits scene?
None is listed for Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster. Viewers tag these on TMDB, so a brand-new film may not be tagged yet.
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster parents guide: is it suitable for kids?
No age rating is listed for Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster yet.
Which OTT platform is Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster on?
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster isn’t streaming on any OTT platform in India yet; it released on 18 July 1976. (Checked 14 November 2026.)
What movies are like Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster?
If you liked Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster, try Mazinger Z vs The Great Dark General, Godzilla: The Planet Eater, Gurren Lagann The Movie: Childhood's End.
Who directed Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster?
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster (1976) was directed by Masayuki Akehi and stars Akira Kamiya, Hiroya Ishimaru, Keaton Yamada.