Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster (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) 48 years old
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
Credits
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster Cast
| Name | Character |
|---|---|
| Akira Kamiya He was 29, now 78 years old | as Ryo Nagare |
| Hiroya Ishimaru He was 30, now 79 years old | as Kôji Kabuto |
| Jōji Yanami He was 45, now 94 years old | as Dr. Umon / Professor Yumi |
| Keiichi Noda He was 32, now 81 years old | as Tetsuya Tsurugi |
| Kousei Tomita He was 40, now 89 years old | as Dr. Saotome |
| Keaton Yamada He was 30, now 79 years old | as Hayato Jin |
| Kei Tomiyama He was 37, 56 years old when he died | as Daisuke Umon / Duke Fleed |
| Rihoko Yoshida She was 27, now 76 years old | as Michiru Saotome |
| Hiroshi Ohtake He was 44, now 92 years old | as Boss |
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster Crew
| Name | Department |
|---|---|
| Susumu Takaku as Screenplay. He was 43 (76) years old when He died | Writing |
| Gou Nagai as Author. He was 30 (now 79) years old | Writing |
| Masayuki Akehi as Director. He was 44 (now 92) years old | Directing |
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster (48 years)
- Release day: Sunday, July 18, 1976
- Runtime: 31 minutes