When the crew of the Kishorn Bravo oil rig, stationed off the Scottish coast, is due to return to the mainland, a mysterious and all-enveloping fog rolls through and they find themselves cut off from all communication with the outside world. As the rig is hit by massive tremors, the crew endeavor to discover what’s driving the unknown force. But a major accident forces them to ask questions about who they can really trust.

Dangerously ill with a rare blood disorder, and determined to save others suffering his same fate, Dr. Michael Morbius attempts a desperate gamble. What at first appears to be a radical success soon reveals itself to be a remedy potentially worse than the disease.