Russ Tamblyn

Dr. Paul Stewart

Kumi Mizuno

Akemi

Kenji Sahara

Dr. Yuzo Majida

Nobuo Nakamura

Dr. Kita

Jun Tazaki

General

Hisaya Ito

Police Chief

Yoshifumi Tajima

Police Officer

Ren Yamamoto

Sailor

Kipp Hamilton

Singer

Kōzō Nomura

General's Aide

Nadao Kirino

Soldier

Shōichi Hirose

Soldier

Tadashi Okabe

Defiant Reporter

Hideo Shibuya

Skeptical Reporter

Ikio Sawamura

Fisherman #1

Seishirō Kuno

Fisherman #2

Someshō Matsumoto

Official

Gorō Mutsumi

Dr. Paul Stewart (voice)

Haruo Nakajima

Gaira

Yû Sekita

Sanda

Yū Fujiki

(uncredited)