Inventor Goro Ibuki
Katsuhiko Sasaki
Rokuro 'Roku-chan' Ibuki
Hiroyuki Kawase
Antonio's Aide (Radio Operator in White)
Rolf Jessup
Narrator
Eisuke Nakanishi
Godzilla
Shinji Takagi
Megalon
Hideto Odachi
Jet Jaguar
Tsugutoshi Komada
Gigan
Kenpachirō Satsuma
Hiroshi Jinkawa
Yutaka Hayashi
Emperor Antonio of Seatopia
Robert Dunham
Lead Seatopian Agent
Kotaro Tomita
Seatopian Agent
Ulf Otsuki
Truck Driver
Gentaro Nakajima
Truck Driver's Assistant
Sakyo Mikami
Man from Unit 1
Fumiyo Ikeda
Japan Special Defense Forces Chief
Kanta Mori
Lyricist
Shinichi Sekizawa
Story
Special Effects Supervisor
Teruyoshi Nakano
Special Effects
Visual Effects Director
Original Music Composer
Riichirō Manabe
Producer
Tomoyuki Tanaka
Original Story
Takeshi Kimura
Director
Jun Fukuda
Screenplay
Director of Photography
Yuzuru Aizawa
Editor
Michiko Ikeda
Production Design
Yoshifumi Honda
Art Direction
Vocals
Masato Shimon
Sound Recordist
Eishiro Hayashi
Lighting Technician
Masakuni Morimoto
Visual Effects Art Director
Toshiro Aoki
Visual Effects Camera
Motoyoshi Tomioka
Production Manager
Keisuke Shinoda
Assistant Director
Tsunesaburo Nishikawa
Visual Effects
Takeshi Miyanishi
Shoji Ogawa
Visual Effects Compositor
Kazunobu Sanpei