Gigantis, the Fire Monster

Tsukioka

Hidemi

Kobayashi (as Mindru Chiaki)

Dr. Yamane

Dr. Tadokoro

Commander (as Serjiro Onda)

Shibeki

Tajima

Radio Operator

Chief of Civil Defense (uncredited)

Ikeda (uncredited)

Convict Leader (uncredited)

Convict (uncredited)

Gigantis (uncredited)

Angurus (uncredited)

Convict (uncredited)

Tsukioka / Policeman (voice) (uncredited)

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

Commander / Father / Convict (voice) (uncredited)

Ikeda / Osaka SDF Dispatcher (voice) (uncredited)