This heading is used as a genre/form heading for 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. 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.
This heading is used as a genre/form heading for films that feature a man-made or natural calamity that places people in imminent danger. Films that feature individuals or groups struggling for their lives in a harsh setting are entered under Survival films.
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