You could include films such as the Terminator in which Kyle Reese is the
good cowboy and Arnie The bad 'un . Deckard in Blade Runner shares many of
the Western hero's character traits, his ability to survive in a hostile
environment, etc. In both of these the Western environs have been
substituted by an Urban landscape
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Online resources for film/TV studies may be found at ScreenSite
http://www.tcf.ua.edu/screensite