Clarence E. Mulford

An evil ranch foreman tries to provoke a range war by playing two cattlemen against each other while helping a gang to rustle the cattle. Each cattleman blames the other for missing cattle. With the help of Bill Cassidy (Hop-along, because of an earlier bullet wound) and Johnny Nelson, the warring cattlemen join forces to do in the outlaws. (imdb)

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

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. (imdb)

Hoppy returns to find Johnny in trouble. Buck Peters has been shot by Porter who made it look like Johnny did it. When Johnny flees he runs into Linda. He takes a liking to her only to learn her father Shanghai is one of Porter's gang. Going after Shanghai, he gets captured by the gang and Porter now plans to kill him. But Hoppy is near by and Johnny will get unexpected help from Shanghai. (imdb)

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. (imdb)

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. (imdb)

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

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

When three Texas Rangers try to investigate kidnapped Mexicans being used as forced labor in the mines of Silver Bullet, they are framed for murder by the town's corrupt sheriff. (imdb)

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. (imdb)

Hoppy goes undercover as an outlaw (which permits him, for once, to drink and be mean to children) to track down a bunch of outlaws operating along the border. Loco, the head bad guy, deflects suspicion from himself by pretending to be a moron. (imdb)

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. (imdb)

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

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

Sue Morgan 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 treasures instead and sell them. Hoppy is on to their plan and pretending to leave follows them. Not only is he outnumbered by Morgan's men, but California has himself about to be sacrificed in an Indian ritual. (imdb)

Three bodies turn up in a frontier hotel. Hoppy solves the murders and chases the killers through unusually misty and dark locations. (imdb)

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

Stephen Westcott and Ed Martin scheme to put Jane Travers' wagon line out of business. They want to use it take over all the wagon- train traffic going west. Hoppy, California and Lucky must make sure that doesn't happen. (imdb)

Before he was killed by Mark Foster's men, Bud Lawton willed part ownership in his ranch to Hoppy and his two pals. When the three arrive they find a fake posing as Lawton. When they expose the imposter, Foster gets the Sheriff to jail them for Lawton's murder. (imdb)

A banker is trying to cheat people out of their silver-rich land. Hoppy learns that the banker is in league with an outlaw gang. (imdb)

The son of an Army friend is about the join an outlaw gang. Hoppy prevents this and brings the gang to justice. (imdb)

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. (imdb)

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. (imdb)

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. (imdb)

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, but in reality he is a cattle rustler who uses his dynamite to scatter the cattle in order capture some of them. Hoppy and Bar 20 guys ultimately capture the professor. (imdb)

Posing as a cattle buyer, Hoppy crosses over into Oklahoma where the Jordan brother's and their outlaw gang operate outside the law. After receiving an unfriendly reception when he finds them, he, California, and Johnny rustle their cattle and drive across the river into Texas. He hopes they will cross over to retrieve their cattle and then he can arrest them. (imdb)

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

After Hoppy helps round up the Trilling gang, Trilling breaks his men out of jail and they rustle the Bar 20 herd for revenge. When Hoppy gets the herd back, Trilling posing as a Marshal not only gets the herd again, he gets the Sheriff to jail the Bar 20 gang. Getting help from the Sheriff's daughter, Hoppy and pals start out once more after Trilling.

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

Lucky is falsely accused of robbing the local bank and assumed drowned in the river while being pursued by a posse. A grieving Hoppy takes exception to remarks made about his presumably dead young friend by local lawyer Cal Howard, and Hoppy knocks him down in public. Howard is engaged to Agnes, the pretty and personable daughter of local cattle rancher Glen Randall, who has borrowed heavily from the town bank in order to buy a herd of breed cattle. (imdb)

Lorna Drake arrives from England to take over the ranch. Although she and Hoppy argue most of the time she takes a liking for Hoppy, angering her fiance Ronald. This enables Scar to enlist Ronald's help in his plan to kill Hoppy. But when Hoppy foils that plan a forest fire develops endangering Lorna. (imdb)

Hoppy goes undercover as a gambler from the East when Bar 20 cattle are stolen by unknown rustlers. Brennan/Talbot are twin brothers (one a casino owner, the other a rancher) and Hoppy believes they provide alibis for each other while one is out committing crimes. Hoppy gets a job in the casino to learn more but is exposed when a gambling gunslinger notices him. (imdb)

Hoppy is busy chasing stagecoach bandits who sing as they rob. (imdb)

During the Spanish-American War, Colonel Teddy Roosevelt's Rough Riders are short of horses, and Hopalong Cassidy and his Bar-20 friends are detailed to round up a bunch of wild horses, but a renegade and his gang are out to stop the roundup. (imdb)

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. (imdb)

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. (imdb)

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 stolen money and sets a trap to bring in the entire gang. (imdb)

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. (imdb)

Buck Colins heads a group of local ranchers who are trying to prevent the railroad from completing its line through their property. Till now they have been able to charge tolls on herds passing through. Hoppy goes undercover to expose them. (imdb)

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. (imdb)

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. (imdb)

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. (imdb)

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

Hopalong and his horse Topper catch bad guys with Red Connors for comic relief.

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. (imdb)

Belle Langtry runs a town being taken over by cattle rustlers. She is also a front for the outlaws, who are led by Steve Fraser. Hoppy gets elected sheriff and cleans up the town with help from the Bar 20 boys. (imdb)

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. (imdb)

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 focus. (imdb)

Hoppy, Johnny and California go to Arabia to buy some horses. There they get involved with a sheik and a harem and a kidnapping plot. (imdb)

The usual gang of bad guys is out to grab up all the available ranch land. This time their object is land belonging to Chinese. As an aside, Hoppy leads some archaeologists through parts of California. (imdb)

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

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. (imdb)

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

Hopalong Cassidy and his sidekick help a friend claim his share of a late uncle's ranch.

Lee Garvin has eloped with the daughter of a railroad man who didn't approve of the marriage. Hoppy steps in when the young man is framed for murder. (imdb)

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. (imdb)

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