Ridley Scott changes the face of modern sci fi with this mixing of high and lowbrow cinema. The clean antiseptic space of Star Trek, 2001: A Space Odyssey and Star Wars is turned into a dirty dank nightmare with winding corners and a monster right out of my he horror genre. H.R. Giger's monster and set designs are as iconic as they are still relevant today. Also Sigourney Weaver as the female heroine action hero is historical. One of the greatest movies ever made.