Escaped criminal "The Fox" hates Hoppy and a Rurales colonel for imprisoning him and lures Cassidy to Mexico in order to exact his vengeance.
| Actor | Role |
|---|---|
 William BoydHopalong Cassidy | Hopalong Cassidy |
 George 'Gabby' HayesWindy Halliday | Windy Halliday |
 Russell HaydenLucky Jenkins | Lucky Jenkins |
 Paul SuttonThe Fox | The Fox |
 Al Ernest GarciaDon Carlos Gonzalez | Don Carlos Gonzalez |
 Jan ClaytonAnita Gonzalez | Anita Gonzalez |
 Trevor BardetteColonel Gonzalez | Colonel Gonzalez |
 Betty AmannJanet Leeds | Janet Leeds |
 Anna DemetrioElena | Elena |
 Glenn StrangeBurke | Burke |
| TTony RouxPancho | Pancho |
 Fred BurnsHenchman | Henchman |
 Cliff ParkinsonHenchman | Henchman |