A fast-shooting woman marshal interferes with the efforts of Hopalong Cassidy and his sidekick Red Connors to track down the bandits who stole a shipment of Army rifles.

Hoppy and Red hide an innocent young Mexican from a lynch mob and then go after the murderer who framed the boy.

Hoppy tries to help an ex-convict, hoping to go straight, who is being blackmailed into joining a plot to rob the Cattlemen's Association.

Hoppy and Red combat a rancher and a crooked lawyer who are trying to drive immigrant settlers off their land.

Hoppy saves an innocent man from hanging and tracks down a murderer who's manipulating the feud between two rival ranchers.

Hoppy tries to prove that a traveling preacher is behind a series of robberies by three men who have a habit of vanishing into thin air.

Hoppy uses an incriminating letter and a crooked card deck to hunt down the murderers of a small boy's parents.

Hoppy's efforts to save a young woman's mine from swindlers are complicated when Red Connors develops amnesia and claims to be a Spanish nobleman.

Hoppy uses an intricately carved bracelet to trap some swindlers who are trying to cheat the Indians out of their oil-rich reservation lands.

A blind Mexican woman asks Hoppy to help her fugitive son, who's been falsely accused of murder.

When Red Connors buys some arid land on the strength of a promised irrigation project, Hoppy investigates and learns that the promoters of the scheme are guilty of forgery, embezzlement and murder.

Hoppy helps government agents search for a herd of 625 stolen horses intended for the Spanish-American War, but when he finds the animals, he has to save them from a grass fire.

Hoppy and Red try to settle a dispute between cattle ranchers and sheep grazers.

Hoppy helps a young man and woman who are framed as counterfeiters just before they are to claim their uncle's estate.

Hoppy and a young minister try to convince a boy who's just committed his first holdup that his gunman idol has feet of clay.

As they ride into an apparently deserted town, Hoppy and Red are shot at, and then discover the town's only resident, also shot and left for dead.

Hoppy and Red discover that two outlaws have ambushed the sheriff of Stone Valley and determine to help the local ranchers against an exploiter who wants to take over the valley and sell it ti the cavalry.

Hoppy fakes amnesia in an attempt to save the cattlemen's bank and the local ranchers from ruin springing from an embezzlement.

Hoppy poses as a cattle buyer in order to break up a ring of thieves who are stealing gold from a smelter.

Hoppy encounters bank robbers who are trying to recover the loot they hid in an old wagon inside the Twin Rivers livery stable.

Hoppy and Red help the U.S. Immigration Service investigate the deaths of smuggled Chinese aliens.

Hoppy tries to prove that a gypsy boy's dead father was not a thief so that the boy can marry his sweetheart.

Assigned to guard the workers building Arizona's first telegraph line, Hoppy learns that a supposedly retired man who owns several stores will lose a fortune if the line is completed, and uses wiretapping to foil a sabotage scheme.

Hoppy uses a health tonic to prove the innocence of a convicted murderer and the guilt of the real killer.

When Hoppy and Red try to conduct an honest election in outlaw territory, the outlaws retaliate by getting Hoppy's nephew into trouble.