Ridley Scott’s masterpiece Alien rewrote the rules of horror and science fiction. His murky, acid rain-drenched noir Blade Runner did the same thing. In many ways, no one has been able to rewrite those rules, though many have tried. No one has gotten what Sir Ridley Scott go so right back then: he humanized the horror. He made the sci-fi feel real. Why did it feel so real? Because it didn’t fall outside the realm of what we know to be possible. Alien breaks no rules of nature, and it doesn’t even seem that hard to imagine ourselves tooling around in a spaceship controlled by an AI with an ulterior motive. The beauty of Alien is that it always felt like a future within our grasp if we weren’t careful. That is what makes it so frightening. Watch the film now, four decades later, and none of it feels dated. It still feels authentic within the persuasively elaborate universe Scott created.