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Hypnotism and mind control take center stage in this unusual latter-day "Hopalong Cassidy" series entry produced by its star, William Boyd. Having delivered a herd of cattle for the Cattlemen's Association, Hoppy (Boyd) and California (Andy Clyde) are confronted by a strangely moody Lucky Jenkins (Rand Brooks), who apparently owes money to a crooked gambler, Speed Blaney (James H. Harrison). At first, Hoppy dismisses the situation as a young man's folly but when both Lucky and the gold payment for the cattle vanish into thin air, our hero begins to suspect foul play. But has the hitherto upstanding Lucky turned thief? That question may be best answered by Doc Richards (Earle Hodgins), a typically flamboyant snake oil salesman with a dark side, and his pretty niece Rene (Virginia Belmont). Like most of the "Hopalong Cassidy" Westerns, Silent Conflict was partially filmed on location at Lone Pine. Leading lady Virginia Belmont later enjoyed a brief career in Italian films.