Nugget Clark has been having his stagecoaches wrecked and Marshal Rocky Lane arrives to investigate. The foreman of a nearby mine is stealing part of the mecury output and selling it in Mexico. Nugget's house has a direct pipeline from the mine and they are trying to drive him into bankruptcy to obtain his ranch. Rocky is quickly aware that the Foremen is behind Nugget's holdups but they are also onto Rocky when he accidently drops his badge during a fight.
| Actor | Role |
|---|---|
 Allan LaneRocky Lane | Rocky Lane |
 Black JackBlack Jack | Black Jack |
 Eddy WallerNugget Clark | Nugget Clark |
 Roy BarcroftJim Boylan | Jim Boylan |
 Myron HealeyDan Booker | Dan Booker |
 Lyle TalbotWalter Fleming | Walter Fleming |
 Claudia BarrettKathy | Kathy |
 Lane BradfordMike | Mike |
 Lee RobertsSpec Matson | Spec Matson |
 Ed CassidyDeputy Marshal | Deputy Marshal |
 Charles EvansMajor Seeley | Major Seeley |
 Zon MurrayHenchman | Henchman |
| SSlim DuncanSergeant | Sergeant |
 Boyd StockmanTom (uncredited) | Tom (uncredited) |