I've had an idea for a game/campaign for a long time that's sci-fi horror set in space. A space ship, space station, lunar base, or something like that. So I'd need a system that covers horror and sci-fi. If it has magic/psychic elements, great, but if not I can do without.
Basically, I want a game that can recreate The Thing. Body horror, paranoia, intrigue is all important for the game I have in mind.
Player characters would ideally be pretty physically weak. I'd like something as rules-lite as possible, although if there's an absolutely perfect, crunch-heavy system out there for this sort of thing, I'd be willing to learn it.
Any suggestions?