A mad scientist is forced to leave San Francisco when his experiments become known. He lands on a tropical island, takes control and terrorizes the local populace. The survivor of a shipwreck washes ashore on the island, sees what is happening and determines to free the natives from his rule.。一艘沉没的海军舰艇的幸存者捕获了一艘俄罗斯潜艇,却发现自己被困在一个充满致命的史前生物的岛屿上。