Dr. Ken Tashiro
Capt. Craig McKenzie / Cmdr. Glenn McKenzie
Dr. Malic / Lt. Hastings
Perry Lawton
Lucretia
Dr. Anne Barton
Dr. Jules Masson
Capt. Kuroiga
Dr. Sugata
Chin
Kobo
Flying Lion / Giant Rat
Dr. Okada
Tsuruko Okada
Additional Voices (voice)
Marine observer
Reporter
Marine Vessel scorer
Medical Petty Officer of Recovery Ship
News Reporter
Minor Role (uncredited)
Other Giant Rat (uncredited)
Correspondent of the base (uncredited)
Sir Maurice Poeley (uncredited)
Ocean Observation Vessel Recorder / Latitude Zero resident (uncredited)
Correspondent of the base B. (uncredited)
Sailor on escort ship (uncredited)
Bat Man / Seaman (uncredited)
Shirtless man at resort. (uncredited)
Man with Gun (uncredited)