@grryboy I would never think of 2001 as horror. Possibly technothriller. Mostly pure #scifi with hard sci-fi elements. Not being a fan of #horror, perhaps my opinion doesn't carry much weight, mixing horror and sci-fi together lessens them both. Event Horizon was only sci-fi because it happened on a ship orbiting Uranus. That story could have been told in any setting with only minor changes.