Katsuhiko Sasaki

Inventor Goro Ibuki

Yutaka Hayashi

Hiroshi Jinkawa

Hiroyuki Kawase

Rokuro 'Roku-chan' Ibuki

Kanta Mori

Japan Special Defense Forces Chief

Kotaro Tomita

Lead Seatopian Agent

Ulf Otsuki

Seatopian Agent

Sakyo Mikami

Truck Driver's Assistant

Fumiyo Ikeda

Man from Unit 1

Robert Dunham

Emperor Antonio of Seatopia

Gentaro Nakajima

Truck Driver

Ralph Jesser

Antonio's Aide (Radio Operator in White)

Shinji Takagi

Godzilla

Hideto Odachi

Megalon

Tsugutoshi Komada

Jet Jaguar

Masachika Mori

Jet Jaguar