An absolute game changer of a movie. It's a masterpiece in every aspect, from the cast, script, direction and music. There is a true cult built around it and we have books and fan films to enjoy. Sadly, the direction of the Alien films have gone downhill and some of the newer ones have CGI that is laughable. The irony is that "Alien" and "Aliens" are far more believable than the cartoonish releases 40 years later. This is a must see. I can't count how often I've seen it and how much enjoyment it always brings.