Here are entered works on films set in a world or civilization after a catastrophic event (e.g., nuclear war, an alien invasion), sometimes also including the period immediately preceding the event. Works on apocalyptic themes in motion pictures that are not themselves apocalyptic films are entered under [Apocalypse in motion pictures.] Works on films set in an uncertain future, in a society ruled by an ineffectual, corrupt, or oppressive regime or by aliens, robots, etc., are entered under [Dystopian films.]