Steven Spielberg might be best known for "Jaws" and "Jurassic Park", but it's aliens where Spielberg seems to keep returning. Despite a huge roster of movies, "E.T". and "Close Encounters of the Third Kind" still remain some of his most iconic ...

Add Yahoo as a preferred source to see more of our stories on Google. Some of the greatest sci-fi movies of all time revolve around humans in a desperate struggle for survival. Sometimes we’re fighting time-traveling robots or out-of-control plagues.