The Thing

In this 1982 sci-fi horror film directed by John Carpenter, a group of researchers stationed in Antarctica encounter a shape-shifting alien that can assimilate and imitate any living being. As paranoia and mistrust spread among the team, they must figure out who is still human and who is not. The film stars Kurt Russell and is renowned for its groundbreaking practical effects. For those interested, it can be viewed on Soap2day for free.