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.
William Boyd
Andy Clyde
Ellanora Needles
Bobby Larson
Victor Jory
Jay Kirby
Forbes Murray
Christian Rub
George Givot
George Reeves
Hal Taliaferro
Bill Nestell
Bob Kortman
Herman Hack
Victor Adamson
Roy Bucko
Bob Burns
Jack Casey
Tommy Coats
Art Felix
Kit Guard
Chick Hannan
Merrill McCormick
Art Mix
George Morrell
Cliff Parkinson
George Sowards
Robert Mitchum