Without a doubt one of my top five horror films of all time! Yes, I know it takes place in space and some would say it's technically science fiction but let's face it...this is the old dark house in outer space. The distance the characters keep with each other (save for Parker and Brett), the worn out look of the Nostromo, the pitch perfect pace of the film not to mention the excellent score are all fantastic. But the real reason this is a true classic is that it changed the look of monsters forever. Try to think of a non-human monster after 1979 that didn't somehow resemble Giger's creation. Cheney doesn't count. Roberts out!