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. For films set in an uncertain future, in a society ruled by an ineffectual, corrupt, or oppressive regime or by aliens, robots, etc., see Dystopian films.
Films that feature a man-made or natural calamity that places people in imminent danger. For films that feature individuals or groups struggling for their lives in a harsh setting see Survival films.