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Thunder over Arizona was the second Republic feature to be lensed in the shortlived Naturama widescreen process. Running a compact 75 minutes, the film is motivated by greed. The hero of the proceedings is Tim Mallory (Skip Homeier), an easygoing cowboy who is mistaken for a notorious gunman. Before he can clear up the misunderstanding, Tim has fallen in with group of corrupt local officials, who intend to wrest control of a valuable silver mine from its rightful owner, pretty Fay Warren (Kristine Miller). For a while, it seems as though the "good guy" is actually one of the villains, but appearances are deceiving. The film's subtext-that lust for wealth can destroy the souls of otherwise decent people-is cleverly if unsubtly woven into the proceedigns.