The Wrecker wrecks trains on the L & R Railroad. One of his victims is Larry Baker's father. Baker wants to find the evildoer, among a host of suspects, but it will be difficult since the Wrecker can disguise himself to look like almost anyone
| Actor | Role |
|---|---|
 John WayneThe Air Pilot | The Air Pilot |
 Tully MarshallThe Railroad Manager | The Railroad Manager |
 Conway TearleThe Railroad Attorney | The Railroad Attorney |
 Shirley GreyThe Secretary | The Secretary |
 Edmund BreeseThe Secretary's Father | The Secretary's Father |
 Lloyd WhitlockThe Air Line Manager | The Air Line Manager |
 Al BridgeThe Station Agent | The Station Agent |
 Matthew BetzThe Engineer Jordan | The Engineer Jordan |
 Joseph W. GirardThe Railroad Detective | The Railroad Detective |
 James P. BurtisThe Railroad Detective's Assistant | The Railroad Detective's Assistant |
 Ernie AdamsBarney | Barney |
 Charles KingMike | Mike |
 J. Farrell MacDonaldJim Baker | Jim Baker |
 Al FergusonSandy | Sandy |
 Glenn StrangeJim | Jim |
 Fred 'Snowflake' ToonesSam (uncredited) | Sam (uncredited) |
 Yakima CanuttHenchman | Henchman |