Space Amoeba

Akira Kubo

Taro Kudo

Yukiko Kobayashi

Saki, native girl

Atsuko Takahashi

Ayako Hoshino

Yoshio Tsuchiya

Dr. Kyoichi Mida

Tetsu Nakamura

Chieftain Ombo

Sachio Sakai

The Editor (uncredited)

Kenji Sahara

Makoto Obata

Yū Fujiki

Promotion Division Manager (uncredited)

Noritake Saito

Rico, the guide (uncredited)

Chōtarō Tōgin

Yokoyama, an agent (uncredited)

Wataru Ōmae

Sakura (uncredited)

Yukihiko Gondō

Islander (uncredited)

Shigeo Katō

Islander (uncredited)

Rinsaku Ogata

Islander (uncredited)

Yûko Sugihara

Stewardess (uncredited)