When it comes to the sci-fi movie genre, it's not out of the realm of possibility to say that the 1970s was the absolute best decade. Certainly these days, the special effects are better than they were back in the day, but it's hard to argue the movies that come out these days are leaving bigger footprints. Films like the Star Wars movie that started it all and Mad Max, Alien and A Clockwork Orange were all released in the 1970s.