Eric Carter

Dr. Arnold Johnson

Yutaka Omura

Osamu Sakurai

Kazuo Fujita (as Keji Sahaka)

Mr. Tako (as Ichiro Arishima)

Osamu Sakurai (voice) (uncredited)

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

Newscaster (uncredited)

Fumiko Sakurai (uncredited)