A horse called Brilliant is the only one who knows the location of a gold mine. When Brilliant's owner is killed, the trio known as the Three Mesquiteers (Bob Steele, Tom Tyler and Jimmie Dodd) are mistakenly arrested for the murder.
| Actor | Role |
|---|---|
 Bob SteeleTucson Smith | Tucson Smith |
 Tom TylerStony Brooke | Stony Brooke |
 Jimmie DoddLullaby Joslin | Lullaby Joslin |
| HHelen DeverellAnn Martin | Ann Martin |
 George J. LewisFreddy | Freddy |
 Walter SoderlingMartin | Martin |
| CCharles MillerFrank Nolan | Frank Nolan |
 Kermit MaynardHenchman Reese | Henchman Reese |
 Pierce LydenHenchman Rankin | Henchman Rankin |
 Carl MathewsHenchman Lon | Henchman Lon |
 Hal PriceSheriff Pillsbury | Sheriff Pillsbury |
 Budd BusterDeputy Bets McGee | Deputy Bets McGee |