In this version of the classic story - based on the smash Broadway musical - Dorothy is a shy 24-year-old Harlem kindergarten teacher who is brought by a snowstorm to the mysterious Land of Oz, a sprawling, decaying, nightmarish, and dangerous megalopolis that resembles the physical characteristics of New York City. The re-telling of the tale includes various urban settings, extreme sadness and melancholy, and features themes of rising above one's background and the expectations of others.
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http://www.imdb.com/title/tt0078504/