小泉博

Tsukioka

若山セツ子

Hidemi

志村喬

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

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)

Marvin Miller

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

Paul Frees

Commander / Father / Convict (voice) (uncredited)

George Takei

Ikeda / Osaka SDF Dispatcher (voice) (uncredited)

James Yagi

Osaka SDF Captain (voice) (uncredited)