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.
The Frontiersmen
1938-12-16
In Old Mexico
1938-09-09
Pride of the West
1938-07-07
Law of the Pampas
1939-11-03
Range War
1939-09-08
Renegade Trail
1939-07-25
Silver on the Sage
1939-03-31
Santa Fe Marshal
1940-01-26
Three on the Trail
1936-04-14
Hopalong Cassidy Returns
1936-10-16
Hopalong Rides Again
1937-08-20
North of the Rio Grande
1937-06-28
Heart of the West
1936-02-24
Texas Trail
1937-11-26
Borderland
1937-02-26
Cassidy of Bar 20
1938-02-25
Call of the Prairie
1936-03-06
Rustlers' Valley
1937-07-23
Hills of Old Wyoming
1937-04-16
Heart of Arizona
1938-04-22