Joseph Cotten

Capt. Craig McKenzie / Cmdr. Glenn McKenzie

Cesar Romero

Dr. Malic / Lt. Hastings

Akira Takarada

Dr. Ken Tashiro

Patricia Medina

Lucretia

Masumi Okada

Dr. Jules Masson

Richard Jaeckel

Perry Lawton

Tetsu Nakamura

Dr. Okada

Mari Nakayama

Tsuruko Okada

Akihiko Hirata

Dr. Sugata

Hikaru Kuroki

Capt. Kroiga

Linda Haynes

Dr. Anne Barton

Susumu Kurobe

Chin

Burr Middleton

Additional Voices (voice)

Haruo Nakajima

Flying Lion/Giant Rat

Osman Yusuf

Man with Gun (uncredited)

Wataru Ōmae

Advisor