Members of an American scientific research outpost in Antarctica find themselves battling a parasitic alien organism capable of perfectly imitating its victims. They soon discover that this task will be harder than they thought, as they don't know which members of the team have already been assimilated and their paranoia threatens to tear them apart.
Based on an "actual event" that took place in 1943. About a US Navy Destroyer Escort that disappeared from the Philadelphia Naval Shipyard, and sent two men 40 years into the future to 1984.
When an alien takes the form of a young widow's husband and asks her to drive him from Wisconsin to Arizona, the government tries to stop them.