Alien

For a 70s movie this is great. All shots of the ship and the interior are so atmospheric. Even if most kills aren't that bloody, Aliens presence is so emphasized that the suspense of the entire thing makes it balance out. The cast is decent enough but Ash turning out to be a robot was the last thing I expected and Ripleys gotta be the best final survivor character. This would be a five but the movie itself didn't make a huge impact on me, still deserving of the classic title though.