I think the original Alien still gives it a run for its money, but I'm hard pressed to think of many creature flicks that can even approach The Thing, much less compete with it. I remember watching it again a few years back and going "man, that was really good. I want to watch some more films like that." and then just looking around and realizing there was absolutely nothing on that level despite it having been 30+ years since it was made. What the fuck is the movie industry even doing if it can't make something that good on the regular?