Michael Keith

Eric Carter

Harry Holcombe

Dr. Arnold Johnson

James Yagi

Yutaka Omura

Tadao Takashima

Osamu Sakurai

Kenji Sahara

Kazuo Fujita (as Keji Sahaka)

Ichirō Arishima

Mr. Tako (as Ichiro Arishima)

George Takei

Osamu Sakurai (voice) (uncredited)

Les Tremayne

Mr. Tako / Dr. Shigesawa / Dr. Akira Makino / General Masami Shinzo / Commander Roberts / Narrator (voice) (uncredited)

Byron Morrow

Newscaster (uncredited)

Mie Hama

Fumiko Sakurai (uncredited)

Akiko Wakabayashi

Tamiye (uncredited)

Akemi Negishi

Chikiro's Mother (Dancing Girl) (uncredited)

Akihiko Hirata

Dr. Kenji Shigezawa (uncredited)

Yū Fujiki

Kinzaburo Furue (uncredited)

Jun Tazaki

General Masami Shinzo (uncredited)