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Oceanographer Dr. Tashiro, physicist Dr. Masson, and newspaperman Perry Lawton are exploring the ocean in a bathysphere when a volcano erupts, causing them to lose control of their vessel. The three explorers are saved by Captain McKenzie, the commander of the submarine Alpha , and he takes them to the undersea city of Latitude Zero, populated by scientists dedicated to the betterment of mankind. On the nearby island of Blood Rock, however, Malic the Murderer plans to kidnap Dr. Okada, who has discovered a serum to protect man against radiation. Malic succeeds in his scheme and takes Okada to Blood Rock where he hopes to learn the scientist's secret by transplanting his brain. Captain McKenzie attempts to rescue Okada but encounters a group of monsters created by Malic to defend the island. McKenzie fights off gigantic rats, a crossbreed of men and bats, and the griffin, a lion-eagle creature, before he is able to rescue Okada; Malic, meanwhile, is destroyed by one of his own hybrid monsters. Tashiro and Masson decide to remain in Latitude Zero, but Perry decides to return to land and tell the spectacular story of their voyage.