The sequel is actually a prequel, tells the story of what happened at the Norweigan base and goes right up to a final scene of them taking off in the helicopter to chase the wolf, so fits together really well with Carpenters film if you watch them back to back. Its actually pretty decent, not as good as the first thing, but a good compliment to it to form the complete story.
Not a bad film at all. I ws expecting it to be rank but was pleasantly surprised.