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.
Hoppy, Lucky and California search for a mine owned by Trudy Pendleton after it was taken from her b...
Finishing a trail drive, Hoppy and the boys head to town and immediately get caught up in the confli...
Sue Morgan gets Hoppy and his friends to join their expedition looking for Indian artifacts. Expedit...
Before he was killed by Mark Foster's men, Bud Lawton willed part ownership in his ranch to Hoppy an...
Joe Weller has instigated a conflict over water rights between two ranchers. The idea is to have the...
Hoppy is busy chasing stagecoach bandits who sing as they rob.
Lee Garvin has eloped with the daughter of a railroad man who didn't approve of the marriage. Hoppy ...
European bad guy Baron Bendor leads some local townsmen in a plot to obtain horses through theft. Ho...
Hopalong Cassidy and Johnny Nelson ride to the mountains to help a man and his daughter save their l...
When Ranger Hoppy's falsely accused young ranger friend is killed while supposedly trying to escape ...
A banker is trying to cheat people out of their silver-rich land. Hoppy learns that the banker is in...
At the reading of his late cousin's will, California learns the estate will be divied among whoever ...
Belle Langtry runs a town being taken over by cattle rustlers. She is also a front for the outlaws, ...
Hoppy and new sidekick California Carlson head to California to help out Lucky Jenkins.
Buck Peters arranges for Hoppy, California, Johnny and other cowboys to go to the aid of friends who...
Hoppy, California and Lucky arrive at a remote inn, where Lucky expects to be married - but finds th...
Hoppy, California and Johnny partner up with brother and sister ranch owners, two of several who are...
One of Hoppy's Bar 20 ranch hands is tricked into participating in nefarious activities after being ...
Posing as a cattle buyer, Hoppy crosses over into Oklahoma where the Jordan brother's and their outl...
Hoppy is leading a scientific expedition and the Chinese who have a hidden settlement nearby are try...