Joseph Cotten

Capt. Craig McKenzie / Cmdr. Glenn McKenzie

Cesar Romero

Dr. Malic / Lt. Hastings

Akira Takarada

Dr. Ken Tashiro

Masumi Okada

Dr. Jules Masson

Richard Jaeckel

Perry Lawton

Patricia Medina

Lucretia

Mari Nakayama

Tsuruko Okada

Akihiko Hirata

Dr. Sugata

Tetsu Nakamura

Dr. Okada

Hikaru Kuroki

Capt. Kroiga

Hitoshi Ōmae

Kobo

Linda Haynes

Dr. Anne Barton

Susumu Kurobe

Chin

Haruo Nakajima

Griffon / Giant Rat / Bat Man

Hiroshi Sekita

Warren / Bat Man

Teruo Aragaki

Giant Rat (uncredited)

Haruyoshi Nakamura

Giant Rat (uncredited)

Susumu Utsumi

Bat Man (uncredited)

Seiji Onaka

Sailor on escort ship (uncredited)

Osman Yusuf

Subordinate with gun (uncredited)

Wataru Ōmae

Advisor (uncredited)

Burr Middleton

Additional Voices (voice) (uncredited)