Gigantis, the Fire Monster

Hiroshi Koizumi Tsukioka

Setsuko Wakayama Hidemi

Minoru Chiaki Kobayashi (as Mindru Chiaki)

Takashi Shimura Dr. Yamane

Masao Shimizu Dr. Tadokoro

Seijirô Onda Commander (as Serjiro Onda)

Sonosuke Sawamura Shibeki

Yoshio Tsuchiya Tajima

Mayuri Mokushô Radio Operator

Yukio Kasama Father (as Yokio Kasama)

Takeo Oikawa Police Chief

Minosuke Yamada Chief of Civil Defense (uncredited)

Ren Yamamoto Ikeda (uncredited)

Shin Ōtomo Convict Leader (uncredited)

Senkichi Ōmura Convict (uncredited)

Haruo Nakajima Gigantis (uncredited)

Katsumi Tezuka Angurus (uncredited)

Shōichi Hirose Convict (uncredited)

Keye Luke Tsukioka / Policeman (voice) (uncredited)

Aya Oyama Hidemi (voice) (uncredited)