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?
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Moon - really good psychological element and great acting.
Pandorum - fun (and a bit hammy) action horror romp.
Twelve Monkeys - really tight and suspenseful plot with great acting.
Being John Malcovich - not sure if this fits in, but a great mind-bender of a sci-fi movie.
There are some generally great small(!) / low budget movies, especially sci-fi. Here’s one example, this one’s basically zero budget but it’s a great one (12min): https://tube.instellate.xyz/watch?v=GhDlV9PDw3Y
I don’t have much of an idea on if it was small but the movie Sunshine (2007) comes to mind. Loved that movie. It’s well worth a watch if you haven’t seen it.