A crusading newspaper editor recruits his old friend Hoppy to take the job of marshal in a town rife with vice and murder directed at helpless miners.

Hoppy is an agent of the federal government investigating the counterfeiting of both U.S. and Mexican money. His only clues are the name "Mordigan" and a drawing of a comet.

Hoppy's ranch is threatened by rustlers. Hoppy and the gang oblige as usual.

Disguising himself as a milquetoast Easterner who writes Western novels, Hoppy enrolls in a dude ranch in order to unmask the murderer of the owner's husband.

Escaped criminal "The Fox" hates Hoppy and a Rurales colonel for imprisoning him and lures Cassidy to Mexico in order to exact his vengeance.

Hoppy goes undercover as an Eastern gambler to rein in the fraternal perpetrators of a cattle-rustling scheme.

What starts as race from China to Boston to earn coveted tea trade contract on the high seas turns into dangerous journey with typhoon, mutiny, and no fresh water.

Hopalong Cassidy (William Boyd) comes to the rescue of the railroad when a land baron and his gang try to prevent its construction.

A gang of outlaws are using force to become possessors of every ranch in the area. Hoppy, of course, is out to stop them.

At the reading of his late cousin's will, California learns the estate will be divied among whoever remains of the seven relatives. With one already dead, another immediately murdered, and ... See full summary »

Hoppy, California, and Lucky must rescue Mrs. Evans from the corrupt sheriff and his black-hatted gang of outlaws.

Hoppy's brother has been murdered and he is on the trail of the murderers. To get them he makes himself seem to be a wanted man.

Hoppy goes to town to help Marshal Windy with some rustlers and winds up helping the widow Joyce when confidence men try to take her herd.

Teacher Lola Blair is against building the saloon right next to her schoolhouse. When she is kidnapped, Hoppy rescues her and forces the saloon keepers to relocate.

Hoppy and Lucky are headed to South America to deliver a herd of cattle. Bad guy Ralph Merritt gets in their way. For a while.

Cattle rustler Nevada dreams of living like an emperor in the West. Hoppy and the Bar 20 boys aim to put an end to his dream.

An evil gang is involved in both cattle rustling and the robbing of stagecoaches. Hoppy must stop them without help from the sheriff who turns out be a major outlaw himself.

Hoppy and new sidekick California Carlson head to California to help out Lucky Jenkins.

Hoppy, Lucky and California are chasing cattle rustlers who have been bothering cattle rancher friends of Hoppy. A crooked foreman is the source of the trouble. Johnny and Lucy are the love... See full summary »

Against a background of exceptional mountain photography, Hoppy rushes to rid former sweetheart Nora Blake and Pappy's range of rustlers and bad guys.

Lorna Drake has inherited a ranch. Hoppy teaches her a bit about ranching and handles Scar Lewis, the bad guy, in the process.

A former Bar 20 cowhand is now a cattle rancher and having trouble with rustlers. Hoppy and the Bar 20 gang ride in and surround the the bad guys. June Winters joins the posse and serves as the romantic partner for posse co-leader Lucky.

Johnny is accused of robbing and bank and runs off into the hills. Hoppy tries to prove his innocence and get the real bad guys.

A town bedeviled with outlaws sends for Hoppy, Lucky and California after their own vigilante committee fails to solve the towns problems. Hoppy discovers that the bad guys are led by the town boss, and so are the vigilantes.

Hoppy, Johnny and Windy are fighting a malicious gang trying to stop a cattle drive from reaching a drought-stricken North.

When the outlaw El Toro saves Hoppy's life, Hoppy agrees to find his missing grandson.

Ranch owner Sally Jordan is engaged in a fence war with rancher Big John Trumbull. Hoppy and Johnny, along with trusty sidekick Windy, side with Sally Jordan. They control a huge cattle stampede by using dynamite.

Sheriff Hoppy has to find a way to bring the bad guys, headed by Tom Jordan, to justice in the Lone Star state. The problem is that they are hiding out beyond his jurisdiction, in Oklahoma.

On a cattle drive Hoppy, camp cook Windy, companion Lucky, and young Artie Peters encounter an eccentric professor. The professor professes to be searching for the evolutionary missing link... See full summary »

One of Hoppy's Bar 20 ranch hands is tricked into participating in nefarious activities after being subjected to hypnosis.

Hoppy and his pals ride to the rescue when hornswogglers threaten a widow's forestland.

Sue Harmon gets Hoppy and his friends to join their expedition looking for Indian artifacts. Expedition leader Atwood makes a deal with nearby cattle rustler Morgan to loot the Indian ... See full summary »

An evil deputy is using Indian half-breeds to rustle cattle. This causes trouble between the cattlemen and Indians. Hoppy, Windy and Lucky see that justice is served. Songs abound.

Outlaw miners have been stealing ore from Ann Dennis' mine. Hoppy spends much of his time running around in the mine shafts tracking down the crooks.

While oil drilling, Hoppy and California discover an underground well - a potential threat to Jebb Hardin's monopoly on water in the region.

Belle Starr has returned from time in prison only to face a hail of bullets, along with rescue by Hoppy and the Bar 20 gang.

Hoppy has to bust up a gang of outlaws with the help of his sidekicks Shanghai and Johnny. As usual, he walks through the fusillade unscathed.

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 ... See full summary »

Hopalong Cassidy (William Boyd) and gang battle sabotaging crooks as they gather more horses for the Spanish-American war.

A bandit who robs both Americans and Mexicans is causing each side of the border to blame the other. Hoppy has to settle matters.

Two American soldiers are captured by the Germans on the Western Front during World War One and escape a POW camp only to stumble into further life-threatening adventures when they come across an Arabian king's daughter while on the lam.

European bad guy Baron Bendor leads some local townsmen in a plot to obtain horses through theft. Hoppy and his sidekicks Lucky and Speedy must find and expose the horse thieves.

When he runs for sheriff, Hoppy is beaten by Jerry Doyle, the gutless wonder voted for by every crook in town. When Hoppy moves to have the new sheriff impeached, outlaw leader Tad Hammond ... See full summary »

When Hoppy's falsely accused young friend is killed while supposedly trying to escape from jail, an embittered Hoppy is blamed and drummed out of the Texas Rangers.

U.S. Marshal Hopalong Cassidy is called when a town becomes overrun with bad guys. Disguised as a member of a medicine show, Hoppy discovers that the ringleader is none other than sweet li'l ol' Ma Burton.

Caldwell and Nixon have their men rob the stage and then critcize the Sheriff for not catching the robbers. With her father the Sheriff under pressure, Mary sends for Hoppy who finds the ... See full summary »

Stagecoach robbers take the money Hoppy was going to use to buy cattle so Hoppy, California and Lin go after them.

Hoppy, Lucky and California search for a mine owned by Trudy Pendleton after it was taken from her by the swindling gambler Ace Gibson. They find the mine and Hoppy fights Gibson over it.

A pretty and gentle schoolteacher from Boston transforms the lives of a spoiled boy and the other residents at 'Bar 20' Ranch, and is courted by Crockett city's Mayor, who is really a livestock thief.

Hoppy and Lucky confront a gang of outlaws which has been ravaging stagecoaches and gold mines. The final gunfight is at Ed Colby's mine.