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PRC's Outlaws of the Rio Grande stars Tim McCoy in his traditional role of a US marshal. Operating around the Mexican border, McCoy is galvanized into action when his best pal is killed by a gang of counterfeiters. Going undercover, our hero heads after the gang into Mexico, intending to unmask the mysterious leader. Heroine Rita (played by band vocalist Virginia Carpenter) is forced by the crooks to lure McCoy into a trap, but the audience never doubts for a moment that Colonel Tim will prevail. Among the heavies is the inescapable Charles King, here cast not in his traditional role of "Blackie" but as "Trigger".