This is a retelling of John Campbell's "Who Goes There?" from the point of view of the alien rather than humans. Or, more likely, a retelling of John Carpenter's movie adaptation titled "The Thing" of the Campbell's story (I haven't seen the movie). The title comes from movie's name.
Best piece I've seen from Watts so far. And the first one I would actually recommend others. Also among the better pieces from Clarkesworld - & I've read quite a bit of their fiction. But read or see one of the originals (linked below) first, if you are unfamiliar with them.
Fact sheet.First published: Clarkesworld, #40 (January 2010).
Download full text/MP3 from publisher's site.
Added to my "best of 2010" list.