Michael Keith
Eric Carter
Acting
Harry Holcombe
Dr. Arnold Johnson
Acting
James Yagi
Yutaka Omura
Acting
Tadao Takashima
Osamu Sakurai
Acting
Kenji Sahara
Kazuo Fujita (as Keji Sahaka)
Acting
Ichirō Arishima
Mr. Tako (as Ichiro Arishima)
Acting
George Takei
Osamu Sakurai (voice) (uncredited)
Acting
Les Tremayne
Mr. Tako / Dr. Shigesawa / Dr. Akira Makino / General Masami Shinzo / Commander Roberts / Narrator (voice) (uncredited)
Acting
Byron Morrow
Newscaster (uncredited)
Acting
Mie Hama
Fumiko Sakurai (uncredited)
Acting
Akiko Wakabayashi
Tamiye (uncredited)
Acting
Akemi Negishi
Chikiro's Mother (Dancing Girl) (uncredited)
Acting
Akihiko Hirata
Dr. Shigezawa (uncredited)
Acting
Yū Fujiki
Kinzaburo Furue (uncredited)
Acting
Jun Tazaki
General Masami Shinzo (uncredited)
Acting
Yoshio Kosugi
Faro Island Chief (uncredited)
Acting
Ikio Sawamura
Witch Doctor (uncredited)
Acting
Kenzō Tabu
Dreary Newscaster (uncredited)
Acting
Tatsuo Matsumura
Dr. Akira Makino (uncredited)
Acting
Victor Millan
Rodrigo Infanta (uncredited)
Acting
Douglas Fein
Commander Roberts (uncredited)
Acting
Haruo Nakajima
Godzilla (uncredited)
Acting
Shōichi Hirose
King Kong (uncredited)
Acting
Katsumi Tezuka
Godzilla in iceberg (uncredited)
Acting
Paul Mason
Misc. Characters (voice) (uncredited)
Production
Bruce Howard
Misc. Characters (voice) (uncredited)
Writing