Hoppy and Lucky are headed to South America to deliver a heard of cattle. Bay guy Ralph Merritt gets in their way. For a while.
| Actor | Role |
|---|---|
 William BoydHopalong Cassidy | Hopalong Cassidy |
 Russell HaydenLucky Jenkins | Lucky Jenkins |
 Sidney TolerFernando "El Melancolio" Lopez Ramirez | Fernando "El Melancolio" Lopez Ramirez |
 Steffi DunaChiquita | Chiquita |
 Sidney BlackmerRalph Merritt | Ralph Merritt |
 Pedro de CordobaValdez | Valdez |
 William DuncanBuck Peters | Buck Peters |
 Anna DemetrioDolores | Dolores |
 Eddie DeanNaples | Naples |
 Glenn StrangeSlim Schultz | Slim Schultz |
| JJo Jo La SavioErnesto | Ernesto |
| RRoy BrentHenchman | Henchman |
 Ken DarbyThe King's Men Member | The King's Men Member |
| JJon DodsonThe King's Men Member | The King's Men Member |
 Martín GarralagaBolo-Carrier | Bolo-Carrier |
 Herman HackRodeo Spectator | Rodeo Spectator |
| BBud LinnThe King's Men Member | The King's Men Member |
| JJohnny LutherHenchman | Henchman |
| JJack MontgomeryBarfly | Barfly |
 Tex PhelpsRodeo Spectator | Rodeo Spectator |
| GGeorge PluesRodeo Spectator | Rodeo Spectator |
| RRad RobinsonThe King's Men Member | The King's Men Member |
| TTony RouxGaucho | Gaucho |
 George SowardsHenchman | Henchman |