Very scarry in a Hitchcockian way. Wonderful use of the alien that you almost never see.
Leonard Maltin/Plot synopsis:
Commercial spacecraft unwittingly takes on an alien being that wreaks merciless havoc on the crew. Space-age horror film reverts to 1950s formula, but adds stomach-churning violence, slime, and shocks. Still, some people's idea of a good time. Oscar-winning effects. Inspired by IT! THE TERROR FROM BEYOND SPACE. Followed by ALIENS. Panavision.