Characters played by Akira Takarada
Dr. Ken Tashiro
Characters played by Joseph Cotten
Capt. Craig McKenzie
Cmdr. Glenn McKenzie
Characters played by Cesar Romero
Dr. Malic
Lt. Hastings
Characters played by Richard Jaeckel
Perry Lawton
Characters played by Patricia Medina
Lucretia
Characters played by Linda Haynes
Dr. Anne Barton
Characters played by Masumi Okada
Dr. Jules Masson
Characters played by Hikaru Kuroki
Capt. Kuroiga
Characters played by Akihiko Hirata
Dr. Sugata
Characters played by Susumu Kurobe
Chin
Characters played by Wataru Ômae
Kobo
Characters played by Haruo Nakajima
Flying Lion
Giant Rat
Characters played by Tetsu Nakamura
Dr. Okada
Characters played by Mari Nakayama
Tsuruko Okada
Characters played by Burr Middleton
Additional Voices
Characters played by Shigeo Katô
Marine observer
Characters played by Akio Kusama
Marine Vessel scorer
Characters played by Enver Altenbay
Minor Role
Characters played by Teruo Aragaki
Other Giant Rat
Characters played by Kathy Horan
Correspondent of the base
Characters played by Andrew Hughes
Sir Maurice Poeley
Characters played by Yoshio Katsube
Sailor
Characters played by Peggy Neal
Correspondent of the base B.
Characters played by Seiji Onaka
Sailor on escort ship
Characters played by Yû Sekita
Bat Man
Seaman
Characters played by Peter Williams
Shirtless man at resort.
Characters played by Osman Yusuf
Man with Gun