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.
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CAST
William Boyd
Hopalong Cassidy
Andy Clyde
California Carlson
Ellanora Needles
Sharon Longstreet
Bobby Larson
Bobby Longstreet
Victor Jory
Dan Slack
Jay Kirby
Johnny Travers
Forbes Murray
Bart Gailey
Christian Rub
Sooky Withers
George Givot
Sam Bucktoe
George Reeves
Harrison Brooke
Hal Taliaferro
Telegrapher Lafe
Bill Nestell
Bartender
Bob Kortman
Blackie
Herman Hack
Henchman Jim
Victor Adamson
Barfly
Roy Bucko
Henchman
Bob Burns
Rancher
Jack Casey
Rancher
Tommy Coats
Posse Rider
Art Felix
Henchman
