
A massive underwater volcano erupts and puts a group of investigative scientists in danger. They are rescued by an atomic super submarine named The Alpha under the command of Captain McKenzie. The group is quickly taken to a vast underwater city known as Latitude Zero, a fantastic, Atlantean type utopia, a world beneath the ocean with its own sun. It is soon discovered that Captain McKenzie is at war with the evil Dr. Malic, a cruel scientist who wishes to rule mankind all the while conducting genetic experiments on humans and animals. Malic sends his agents to kidnap Dr. Okada, a human scientist who has created a serum that can immunize exposure to radiation.

as Capt. Craig McKenzie / Cmdr. Glenn McKenzie

as Dr. Malic / Lt. Hastings

as Dr. Ken Tashiro

as Dr. Jules Masson

as Perry Lawton

as Lucretia

as Tsuruko Okada

as Dr. Sugata

as Dr. Okada

as Capt. Kroiga

as Kobo

as Dr. Anne Barton

as Chin

as Griffon / Giant Rat / Bat Man

as Warren / Bat Man

as Giant Rat (uncredited)

as Giant Rat (uncredited)

as Bat Man (uncredited)

as Sailor on escort ship (uncredited)

as Subordinate with gun (uncredited)

as Advisor (uncredited)

as Additional Voices (voice) (uncredited)