The bad guys dynamite a fish hatchery. They're trying to put the hatchery out of business so they can get possession of oil underneath the lake. Roy is a game warden investigating the dynamiting.
| Actor | Role |
|---|---|
 Roy RogersRoy Rogers | Roy Rogers |
 TriggerTrigger - Roy's Horse | Trigger - Roy's Horse |
 Dale EvansKay 'Doc' Parker | Kay 'Doc' Parker |
 Estelita RodriguezRita | Rita |
 Martín GarralagaCarlos | Carlos |
 Robert Emmett KeaneMartin Masters, Newspaper editor | Martin Masters, Newspaper editor |
 Lucien LittlefieldRussell Masters | Russell Masters |
 Douglas FowleyRoberts aka Walter P. Johnson | Roberts aka Walter P. Johnson |
 David SharpeHenchman Vince | Henchman Vince |
 Robert BiceBob Oliver | Bob Oliver |
| FFoy WillingFoy | Foy |
 Peter BroccoNot listed | Not listed |
 Mauritz HugoNot listed | Not listed |