When two of their Marshal friends are killed, the Rough Riders are sent to investigate. They have to find the killers in a ghost town where the houses and an old mine are interconnected by secret passages and tunnels.
| Actor | Role |
|---|---|
 Tim McCoyMarshal Tim McCall | Marshal Tim McCall |
 Buck JonesMarshal Buck Roberts | Marshal Buck Roberts |
 Raymond HattonMarshal Sandy Hopkins | Marshal Sandy Hopkins |
 Virginia CarpenterJosie Hall | Josie Hall |
| HHoward MastersTom Cook | Tom Cook |
 Murdock MacQuarrieJudge Crail (as Murdock McQuarrie) | Judge Crail (as Murdock McQuarrie) |
 Charles KingHenchman Gus | Henchman Gus |
 Tom LondonAce, Chief Thug | Ace, Chief Thug |
 Ben CorbettRed Larkin | Red Larkin |
 Milburn MoranteLuke Martin | Luke Martin |
| JJack BaxleyChief Marshal Pat Madderson | Chief Marshal Pat Madderson |
 Eddie PhillipsThe Caretaker, called "The Kid" | The Caretaker, called "The Kid" |
 Frank LackteenPawnee | Pawnee |
 Artie OrtegoGang's Lookout in Town | Gang's Lookout in Town |
 Bob WalkerMarshal O'Neal | Marshal O'Neal |