Hiroshi Koizumi as Shoichi Tsukioka

Keye Luke as Shoichi Tsukioka (voice)

Setsuko Wakayama as Hidemi Yamaji

Aya Oyama as Hidemi Yamaji (voice)

Minoru Chiaki as Kôji Kobayashi

Marvin Miller as Koji Kobayashi / Narrator (voices)

Masao Shimizu as Dr. Tadokoro

Mayuri Mokushô as Yasuko Inouye, Koji's girl

Takeo Oikawa as Osaka Chief of Police

Minosuke Yamada as Chief of Civil Defense

Takashi Shimura as Doctor Yamane

Sonosuke Sawamura as Foreman Shibeki

Yoshio Tsuchiya as Member of Osaka's SDF Tajima

Yukio Kasama as President of Fishery Koehi Yamaji

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

Ren Yamamoto as Commander of Landing Craft Ikeda

George Takei as Commander of Landing Craft Ikeda (voice)

Seijirô Onda as Commander of Osaka's SDF Terasawa

Shin Ōtomo as Convict Leader

Senkichi Ōmura as Convict

Haruo Nakajima as Gigantis

Katsumi Tezuka as Angurus

Shōichi Hirose as Convict