The ranger Jack Dunne and his dog Dynamite are called in to investigate a series of cattle rustlings.
| Actor | Role |
|---|---|
| DDynamite the DogDynamite | Dynamite |
 Edmund CobbJack Dunne | Jack Dunne |
 Marjorie BonnerKaty Pearl Lee | Katy Pearl Lee |
 Pearl SindelarMary Doolittle | Mary Doolittle |
 Francis FordBrom Hockley | Brom Hockley |
| PPatrick RooneyBull Becker (as Pat Rooney) | Bull Becker (as Pat Rooney) |
| FFrank ClarkHandsome Thomas (as Frank M. Clark) | Handsome Thomas (as Frank M. Clark) |
| CCarl SepulvedaJake | Jake |
| LLee LinCook | Cook |