As regarding the utopian/dystopian thread: most of the films (not all)
that have been pointed out so far have mainly been science-fiction - ]
obviously, because this genre easily lends itself to utopian or
dystopian society-models. However, there are several excellent films
that present alternate societies without begin science-fiction.
The most striking example of this is probably Welles' _The Trial_ from
the Franz Kafka novel. It has the themes of an individual against
an unknown society (as mentioned by an earlier poster) but is not
presented as science fiction, mainly as an alternate society to a large
extent modelled on our own (incorporating wedtern ideas of justice and
democracy - but distorting them).
Hope this helps.