Isn’t that the exact plot of John Carpenter's “The Thing”?
1951 -- The Thing From Another World, directed by Christian Nyby, is a sci-fi film in which scientists go to North Pole to investigate a UFO, find crashed craft and frozen alien. They take alien back to base and unintentionally let it thaw. (see above)
1982 -- The Thing a film directed by John Carpenter. Same basic story as above (but as in the original, the plot takes place in Antartica).
2011 -- The Thing a film directed by Matthijs van Heijningen Jr. Same basic story again, but it is the prequel to the 1982 version.
In the 1982 film, it's a dog-clone-thing that brings the chaos from the Norwegian base to the US one.