The Mesquiteers try to help their friend build a telegraph system, despite a local newspaper editor's attempts to sabotage the lines.
| Actor | Role |
|---|---|
 Robert LivingstonStony Brooke | Stony Brooke |
 Bob SteeleTucson Smith | Tucson Smith |
 Rufe DavisLullaby Joslin | Lullaby Joslin |
 Pauline MooreMarcia Kelton | Marcia Kelton |
 Weldon HeyburnJeff Bradley | Jeff Bradley |
 Carroll NyeJim Chapman | Jim Chapman |
 Tom ChattertonMajor R.C. Kelton | Major R.C. Kelton |
 Si JenksT.L. Johnson (dentist) | T.L. Johnson (dentist) |
| MMary FieldAlice Chapman | Alice Chapman |
 John MertonHenchman Mason | Henchman Mason |
 Rex LeaseEngineer Reynolds | Engineer Reynolds |
| RRobert BlairStage passenger | Stage passenger |