I can't say which films were the most influential, but here's a list of ones which were at least as influential IMHO and also sort of stand on their own: Star W

I can't say which films were the most influential, but here's a list of ones which were at least as influential IMHO and also sort of stand on their own: Star Wars Trilogy (epic sci-fi), 2001: A Space Odyssey (hard sci-fi), The Thing (body horror sci-fi), Alien (body horror/dystopian sci-fi), Mad Max (post apocalyptic sci-fi), E.T. (family sci-fi? lol), The Terminator (post apocalyptic), Howard the Duck (still reading?), Predator (dunno?) I could list a lot of others but I'll stop there.