Taro Kudo

Akira Kubo

Ayako Hoshino

Atsuko Takahashi

Dr. Kyoichi Mida

Yoshio Tsuchiya

Saki, native girl

Yukiko Kobayashi

Makoto Obata

Kenji Sahara

Rico

Noritake Saito

Chieftain Ombo

Tetsu Nakamura

The Editor (uncredited)

Sachio Sakai

Ombo

Satoshi Nakamura

Asia Development Promotion Division Manager

Yū Fujiki

Yokoyama

Chotaro Togin

Sakura

Wataru Omae

Stewardess (uncredited)

Yûko Sugihara

Islander (uncredited)

Yukihiko Gondô

Stewardess

Yuko Sugihara

Islander (uncredited)

Shigeo Katō

Islander (uncredited)

Rinsaku Ogata

Gezora / Ganimes / Taro Kudo (water scene stunt double)

Haruo Nakajima

Kamoebas

Haruyoshi Nakamura

Space Amoeba / Narrator (voices) (uncredited)

Ichirô Murakoshi

Airplane Passenger (uncredited)

Sōji Ubukata

News Reporter (uncredited)

Yoshio Katsube

News Reporter (uncredited)

Eisaburo Komatsu

News Reporter (uncredited)

Kôichi Satô

Bystander (uncredited)

Kamayuki Tsubono

Sergio Islander (uncredited)

Seiji Onaka

Sergio Islander (uncredited)

Masaki Shinohara