The Enigma Corporation is hired by an oil company to investigate one of their remote drilling encampments to determine the cause of their workers' mysterious deaths.

A former astronaut is placed under psychiatric and medical observation after reporting strange ailments with no known medical cause; are her symptoms psychosomatic, or has she returned to Earth the unwitting host to an unknown life form?

While hiking in Montana, a father and daughter are attacked by a grizzly; after visiting hot springs in a nature park, a mother and son are mauled by a 400-pound black bear; two friends are ambushed by a grizzly bear in the Alaskan wilderness.

The Shark Men are headed back to the waters where they have successfully caught and tagged almost a dozen sharks; Guadalupe Island. Dr. Domeier almost has enough data to support his theory about great whites mating at the island.

Jimmy hits the road with the best volunteers, leaving Paul with only Scott to help him catch treacherous gators and snakes; while Paul struggles to keep Gator Boys afloat, Jimmy is attacked by a tarantula, and tasered, cuffed and taken away by the police.