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.
as Hopalong Cassidy
as California Carlson
as Sharon Longstreet
as Bobby Longstreet
as Dan Slack
as Johnny Travers
as Bart Gailey
as Sooky Withers
as Sam Bucktoe
as Harrison Brooke
as Telegrapher Lafe
as Bartender
as Blackie
as Henchman Jim
as Barfly
as Henchman
as Rancher
as Rancher
as Posse Rider
as Henchman
as Townsman
as Henchman
as Rancher
as Posse Rider
as Rancher
as Henchman
as Posse Rider
