The 1962 French film, La Jetee, details a fractured society in a dystopian future (or past?). There is one man and one hope to try and gain help from another time. This short film inspired Terry Gilliam to make the movie 12 Monkeys, and it mirrors the story somewhat.
The whole film (26 minutes) is on Google Video. I am embedding it here, but I suggest clicking on it so that it will open the larger version at Google Video.
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