Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster
Overview
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
Trailer
Cast

Akira Kamiya
Ryo Nagare

Hiroya Ishimaru
Kôji Kabuto

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

Kosei Tomita
Dr. Saotome