Humanoid sea creatures start killing a fishing town's residents, and raping their women. It's up to the townsfolk and a visiting biologist to fight back and fend them off.
A Victorian era scientist and his assistant take a test run in their Iron Mole drilling machine and end up in a strange underground labyrinth ruled by a species of giant telepathic bird and full of prehistoric monsters and cavemen.
A US coast guard finds only a woman still alive aboard a shipwreck. She tells her rescuer what happened and soon, they find themselves trapped in a mysterious part of the ocean known as Satan's Triangle.