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?
Altered States comes to mind. It sort of straddles sci-fi and horror without really being firmly in either. Deals with some fringe psychology research during the 70’s going wrong in unexpected ways.
Brainstorm is more obviously sci-fi / speculative fiction… can’t say to much else without spoiling the surprises.
Neither one of these is going to seriously blow your mind, but there’s still food for thought. Bon appétit. 
