Massive dehumanization, totalitarian government, rampant disease, post-apocalyptic terrains, cyber-genetic technologies, societal chaos and widespread urban violence are some of the common themes in dystopian films which bravely examine the ominous shadow cast by future.
A dystopia is a fictional society that is the antithesis or complete opposite of a utopia, an ideal world with a perfect social, political and technological infrastructure. A world without chaos, strife or hunger. A world where the individual potential and freedom is celebrated and brought to the forefront.
In contrast, the dystopian world is undesirable with poverty and unequal domination by specific individuals over others. Dystopian films often construct a fictional universe and set it in a background which features scenarios such as dehumanizing technological advancements, man-made disasters or class-based revolutions. (From snarkerati.com)