""Hoppy" goes into ACTION against Cattle Rustlers!"
As rustled cattle have mysteriously disappeared, Johnny sends for his friend Hoppy, Hoppy arrives and immediately suspects Dan Slack. Realizing his telegram about Slack was intercepted, he locks up the operator Lafe knowing he can escape. Tailing Lafe he finds a secret entrance to a mine and inside finds the missing cattle. But Slack's men also find him just as the cattle are stampeded through the mine shaft.
Hopalong Cassidy

California Carlson

Sharon Longstreet
Bobby Longstreet

Dan Slack

Johnny Travers

Bart Gailey

Sooky Withers

Sam Bucktoe

Harrison Brooke

Telegrapher Lafe

Bartender

Blackie

Henchman Jim

Barfly

Henchman
Rancher

Rancher
Posse Rider
Henchman
Townsman

Henchman
Rancher
Posse Rider

Rancher

Henchman

Posse Rider

Unknown Role
