Following World War II and quickly transitioning into the Cold War, fears across the planet became more globalized and mainstream, naturally making their way in to our films, by way of pulpy novels by writers like Richard Matheson (I Am Legend). 1950s American cinema would arguably birth modern sci-fi as we know it, allegorically substituting Russian foe for that of a some Martian invader opting to invade, you guessed it, somewhere in America, threatening all that is good and just along the way.