US Border Patrolman Roy Rogers is assigned to prevent a herd of diseased cattle from crossing over from Mexico.
| Actor | Role |
|---|---|
 Roy RogersRoy Rogers | Roy Rogers |
 TriggerTrigger | Trigger |
 Dale EvansCathy Marsh | Cathy Marsh |
 Estelita RodriguezElena Madera | Elena Madera |
 Pinky LeePinky | Pinky |
 Anthony CarusoLucky Grillo | Lucky Grillo |
 Roy BarcroftWard Sloan | Ward Sloan |
| EEduardo JiminezPancho Lopez | Pancho Lopez |
 Ken TerrellTony | Tony |
 Emmett VoganColonel Wells | Colonel Wells |
 Maurice JaraLopez | Lopez |
 Pat BradyPat (uncredited) | Pat (uncredited) |
 Virginia CarrollWells' Secretary (uncredited) | Wells' Secretary (uncredited) |
| AArt FelixHenchman (uncredited) | Henchman (uncredited) |
| DDuke TaylorHenchman (uncredited) | Henchman (uncredited) |
| WWilliam RuhlSheriff (uncredited) | Sheriff (uncredited) |
 Rex LeaseCattleman at Meeting (uncredited) | Cattleman at Meeting (uncredited) |