The 1982 John Carpenter
science fiction horror The Thing
never fails to satisfy. It is crawling with ambiguity from start to finish, so much so that not even a rewatch can do it justice. The shapeshifting and hostile Thing infiltrates a U.S Antarctic research center after having already destroyed a Norwegian base.
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It takes the unassuming form of a dog, a creature that seems to be fleeing for its life from a crazy man intent on doing it harm, and, just as it snuck its way into the base, it snuck up on viewers too.