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)
