Alien/Aliens is a given for most people. I have been watching Event Horizon during the spooky season for years. What are some of your favorite books and movies with a horror/psychological thriller lean?
For films, Under The Skin (2013 indie film directed by Jonathan Glazer and starring Scarlett Johanson in a pretty low-key role for the most part) is fantastic. More on the horror end, but has strong scifi elements. Amazingly crafted film, nothing really gory at all, the horror is all psychological, but it has such disturbing moments that stick in your head (unwanted) for years. I’ve watched it 3 times though, so that may be part of the problem.