The Valley of Gwangi
Cowboys Battle Monsters in the Lost World of Forbidden Valley.
The Valley of Gwangi is a 1969 American western-fantasy film directed by Jim O'Connolly and written by William Bast.
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Cowboy James Franciscus seeks fame and fortune by capturing a Tyrannosaurus Rex living in the Forbidden Valley and putting it in a Mexican circus. His victim, called the Gwangi, turns out to have an aversion to being shown in public. Another film featuring the stop-action special effects talents of Ray Harryhausen.