Michael Keith
Eric Carter
Harry Holcombe
Dr. Arnold Johnson
Tadao Takashima
Osamu Sakurai
Kenji Sahara
Kazuo Fujita
Les Tremayne
Commander Roberts / General Masami Shinzo / Narrator (voice)
Bruce Mason
Misc. characters (voice)
Paul Howard
Misc. characters (voice)
Yû Fujiki
Kinsaburo Furue
Akihiko Hirata
Dr. Shigezawa (uncredited)
Mie Hama
Fumiko Sakurai (uncredited)
Akiko Wakabayashi
Tamiye (uncredited)
Jun Tazaki
General Masami Shinzo (uncredited)
Akemi Negishi
Chikiro's Mother (Dancing Girl) (uncredited)
Yoshio Kosugi
Farou Island Chief (uncredited)
Ikio Sawamura
Witch Doctor (uncredited)
Kenzô Tabu
Dreary Newscaster (uncredited)