It's 1982. Dr. Sander Halvorson recruits graduate student Kate Lloyd (Mary Elizabeth Winstead of DEATH PROOF, FINAL DESTINATION 3) to go to a Norwegian research post in Antarctica, where something incredible has been discovered. They have found a flying saucer that crashed there a hundred thousand years before. They find the craft's occupant buried in the ice and take it back to the complex. Of course, it escapes and begins mimicking the humans, one by one. It doesn't help that Kate and Sander are at odds with each other. She wants to be cautious about the discovery while he blindly messes up.
Basically, this follows the formula of the John Carpenter movie, though there are a few interesting twists, like the "test" they come up with to see if someone is an alien or not. And while I thought I might have a problem with the CGI effects, as the original Rob Bottin creatures were amazing, they actually work better. The monsters are more realistic and intense. I also liked how the ending seamlessly ties into the beginning of the '82 movie. All in all, a very good prequel.