A notorious criminal, 'The Fox', escapes from prison and seeks revenge against Colonel Gonzalez and Hoppy, who had previously captured him. He kills Gonzalez and enlists the help of his sister Janet, while Hoppy finds himself drawn to Janet's charms.
In Old Mexico
A notorious outlaw, known as "The Fox", seeks revenge against Hoppy and a Rurales colonel who wrongfully imprisoned him, and orchestrates a plan to lure Cassidy to Mexico to exact his revenge.
