Hiroshi Koizumi
Tsukioka
Acting
Setsuko Wakayama
Hidemi
Acting
Minoru Chiaki
Kobayashi (as Mindru Chiaki)
Acting
Takashi Shimura
Dr. Yamane
Acting
Masao Shimizu
Dr. Tadokoro
Acting
Seijirô Onda
Commander (as Serjiro Onda)
Acting
Sonosuke Sawamura
Shibeki
Acting
Yoshio Tsuchiya
Tajima
Acting
Mayuri Mokushô
Radio Operator
Acting
Yukio Kasama
Father (as Yokio Kasama)
Acting
Takeo Oikawa
Police Chief
Acting
Minosuke Yamada
Chief of Civil Defense (uncredited)
Acting
Ren Yamamoto
Ikeda (uncredited)
Acting
Shin Ōtomo
Convict Leader (uncredited)
Acting
Senkichi Ōmura
Convict (uncredited)
Acting
Haruo Nakajima
Gigantis (uncredited)
Acting
Katsumi Tezuka
Angurus (uncredited)
Acting
Shōichi Hirose
Convict (uncredited)
Acting
Keye Luke
Tsukioka / Policeman (voice) (uncredited)
Acting
Aya Oyama
Hidemi (voice) (uncredited)
Acting
Marvin Miller
Kobayashi / Dr. Yamane / Narrator (voice) (uncredited)
Acting
Paul Frees
Commander / Father / Convict (voice) (uncredited)
Acting
George Takei
Ikeda / Osaka SDF Dispatcher (voice) (uncredited)
Acting
Jane Chang
Radio Operator (voice) (uncredited)
Acting
James Yagi
Osaka SDF Captain (voice) (uncredited)
Acting