Cast
Katsuhiko Sasaki (Inventor Goro Ibuki)Hiroyuki Kawase (Rokuro 'Roku-chan' Ibuki)Yutaka Hayashi (Hiroshi Jinkawa)Robert Dunham (Emperor Antonio of Seatopia)Kôtarô Tomita (Lead Seatopian Agent)Ulf Ôtsuki (Seatopian Agent)Gentaro Nakajima (Truck Driver)Sakyo Mikami (Truck Driver's Assistant)Fumiyo Ikeda (Man from Unit 1)Kanta Mori (Japan Special Defense Forces Chief)Shinji Takagi (Gojira)Hideto Odachi (Megaro)Tsugutoshi Komada (Jetto Jagâ)Kenpachirô Satsuma (Gaigan)Ralph Jesser (Antonio's Aide (Radio Operator in White))Eisuke Nakanishi (Asuka Island Nuclear Test (Narrator))Teruo Nigaki (Radon)Yû Sekita (Angirasu)
Directors
Yoshimitsu Banno, Jun Fukuda, Ishirô Honda
Synopsis
The underground kingdom of Seatopia sends out Megalon, a giant beetle, and Gigan to destroy the above ground dwellers. In an attempt to stop them, an independently thinking robot brings Godzilla into the fight.