Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster (1976) film poster — UK streaming guide

Where to watch Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster (1976) in the UK

Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster (1976) is not currently listed on any UK streaming, rental, or purchase service. Last verified on 17 May 2026 by ScreenSearch.

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

  • Film
  • 1976
  • 31 min
  • ★ 6.0/10 TMDB
  • Action
  • Adventure
  • Animation

Watch the trailer

Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! Great Sea Beast (1976) - Trailer

Streaming options in the United Kingdom

Updated daily from The Movie Database. Outbound links open the provider directly.

We couldn't find any current UK streaming, rental, or purchase listings for Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster.

This may be because: (a) the title hasn't been released in the UK yet, (b) it's on physical media only, or (c) the licence has temporarily lapsed. Streaming availability changes frequently — check back daily.

Last verified: — sourced from The Movie Database. Machine-readable: Markdown · JSON.

Cast & crew

Top-billed cast in Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster.

DirectorMasayuki Akehi
WriterSusumu Takaku

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Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster — frequently asked questions

Where can I watch Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster in the UK?

Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster (1976) is not currently listed by any UK streaming, rental, or purchase service in our daily-updated TMDB feed. It may be on physical media, an aggregator, or pending a UK release. Check back later — availability changes frequently.

Is Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster on Netflix, Disney+ or Amazon Prime Video in the UK?

Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster is not currently included with any major UK subscription service. It may still be available to rent or buy.

How accurate is this film's availability data?

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