小泉博

Tsukioka

若山セツ子

Hidemi

千秋実

Kobayashi (as Mindru Chiaki)

Takashi Shimura

Dr. Yamane

清水将夫

Dr. Tadokoro

恩田清二郎

Commander (as Serjiro Onda)

二代目 澤村宗之助

Shibeki

土屋嘉男

Tajima

木匠マユリ

Radio Operator

Yukio Kasama

Father (as Yokio Kasama)

笈川武夫

Police Chief

山田巳之助

Chief of Civil Defense (uncredited)

山本廉

Ikeda (uncredited)

大友伸

Convict Leader (uncredited)

大村千吉

Convict (uncredited)

中島春雄

Gigantis (uncredited)

手塚勝巳

Angurus (uncredited)

広瀬正一

Convict (uncredited)

Keye Luke

Tsukioka / Policeman (voice) (uncredited)

Aya Oyama

Hidemi (voice) (uncredited)

Marvin Miller

Kobayashi / Dr. Yamane / Narrator (voice) (uncredited)

Paul Frees

Commander / Father / Convict (voice) (uncredited)

George Takei

Ikeda / Osaka SDF Dispatcher (voice) (uncredited)

Jane Chang

Radio Operator (voice) (uncredited)

James Yagi

Osaka SDF Captain (voice) (uncredited)