(0 votes, average: 0.00/10)- Country: Japan
- Genres: Action, Animation, Short
- Release: 1976-07-18
- Director: Masayuki Akehi
- Writers: Go Nagai , Susumu Takaku
- Language: Japanese
- Stars: Hiroya Ishimaru , Akira Kamiya , Minori Matsushima , Yumi Nakatani , Keiichi Noda , Kenichi Ogata , Kotoe Taichi , Kôsei Tomita , Kei Tomiyama , Kei Tomiyama , Keaton Yamada
- Runtime: 31 min
- Awards: N/A
- AKA: 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 (Japan) , Gurendaizâ, Gettâ Robo jî, Gurêto Majingâ - Kessen! Daikaijû , Grandizer, Getter Robot G, Great Mazinger Decisive Battle! The Great Sea Monster , Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! Great Sea Beast , Goldorak, Getter Robot G et Great Mazinger contre le Dragonosaure (France, French Republic) , Mazinga contro gli Ufo Robot (Italy) , Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! Great Sea Beast , Il grande mazinga, Getta Robot G, UFO Robot Goldrake contro il Dragosauro (Italy) , Getta: To super robot (Greece)
- Plot: When a mysterious gigantic monster, called Dragosaur, appears from the depth of the oceans and threatens the world, a team of super-robots from Japan is activated and sent out to defeat it: Grendizer, The Great Mazinger and Getter G.
- IMDB:tt0422360
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Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! Great Sea Beast Cast · · · ALL
Masayuki Akehi
Director
Akira Kamiya
Ryo Nagare
Keaton Yamada
Hayato Jin
Kei Tomiyama
Daisuke Umon / Duke Fleed
Keiichi Noda
Tetsuya Tsurugi
Joji Yanami
Dr. Umon / Professor Yumi
Rihoko Yoshida
Michiru Saotome
Hiroshi Ôtake
Boss
Kousei Tomita
Dr. Saotome
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