Gigantis, the Fire Monster

Shoichi Tsukioka

Shoichi Tsukioka (voice)

Hidemi Yamaji

Hidemi Yamaji (voice)

Kôji Kobayashi

Koji Kobayashi / Narrator (voices)

Dr. Tadokoro

Yasuko Inouye, Koji's girl

Osaka Chief of Police

Chief of Civil Defense

Doctor Yamane

Foreman Shibeki

Member of Osaka's SDF Tajima

President of Fishery Koehi Yamaji

Doctor Kyohei Yamane, Commander of Osaka's SDF Terasawa, President of Fishery Koehi Yamaji (voices)

Commander of Landing Craft Ikeda

Commander of Landing Craft Ikeda (voice)

Commander of Osaka's SDF Terasawa

Convict Leader

Convict

Gigantis

Angurus

Convict