But with so many movies to pick from, it begs the question: What are the greatest '80s sci-fi movies of all ... kicked off by movies like Star Wars, Alien, and Close Encounters of the Third ...

Movies like Aliens, Predator, Scanners, They Live, Videodrome, and many others prove the '80s was a defining period for sci-fi horror. But this decade didn't just bring about the best in the genre ...