The Thing (1982)

A group of scientists are on a station in Antarctica when they encounter an apparently alien life form. They soon realize that the creature can take the form of other beings, so any one of them could be an imposter. The sense of tension and paranoia that comes with the situation is palpable, confronting everyone in a psychological battle against their own fears. Directed by John Carpenter and remake of a 1951 film, it is a must see for genre lovers.