THIS HAS BEEN REVISED.. I wrote Sweeds (Swedes) instead of Norwegians.. a dozen, six times, Same Thing I Guess. My Apologies, hopefully I'll get more votes.
Antarctica. Winter. 1982. Good enough plot to me. A group of scientists in the Antarctic hear gunshots outside and what appears to be a Norwegian helicopter shooting down at a snow dog. Before the Norwegians could kill the dog, Garry shoots the Norwegian and the helicopter explodes. (if you look closely you can actually see the body get sent high into the air) From that moment where they take the so called "dog" into their base, nothing will ever be the same. Morhping and killing other dogs in the kennel, The group finds themselves staring at an alien being far beyond what they are prepared for or what they could believe. When disected and studied, the scientists find out the being was not a dog, but something immitating the dogs cells and genetic structure; spawning the thought of who else might be just a clone or copy of themselves. Riddled by this, a few members venture to where the Norwegians base is located and discover that the Norwegians discovered a space ship type structure.. and even worse, looked as if something from that ship was thawed out recently. Paranoia gets to the best of just about every character as each is accused by the other of being taken over by this "thing" and insanity sets in shortly there after. Some of the most gruesome dimemberments and odd distortions of the human figure; drugs had to be in John Carpenter's system while shooting this notch in movie history. Don't just WANT to see this movie... SEE IT.
Childs: You're gonna have to sleep sometime, MacReady.
MacReady: I'm a real light sleeper, Childs.