Hoppy and his pals arrive in a remote town to investigate the counterfeiting of both U.S. and Mexican money; his only clues are the name "Mordigan" and a drawing of a comet. He quickly finds out that Mordigan is the town "boss"; but what or who is "the comet", and why are Mordigan and his henchmen intent on persecuting a young woman, her drunken brother, and her deathly ill sister-in-law who've also just arrived in town?

Hopalong Cassidy and Johnny Nelson ride to the mountains to help a man and his daughter save their logging business from someone who is sabotaging their efforts.

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

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.

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.

Tale of a pair of dam workers who, despite their strong friendship, duke it out on a regular basis. But when the dam threatens to burst, the battling buddies work side by side to rescue the deluge-threatened townsfolk.

Produced under the supervision of the U.S. Navy. James Randall, an upperclassman at the Naval Academy, falls in love with Patricia Lawrence, the sister of a plebe. She is engaged to Basil Courtney, a wealthy reprobate who arranges with Rita to discredit James.

Monte Brewster learns that he has inherited $10 million from his late grandfather, but then learns that he must spend $2 million in less than a year and remain unmarried to inherit the rest of the money.

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 to town to help Marshal Windy with some rustlers and winds up helping the widow Joyce when confidence men try to take her herd. King's Men songs include: "Hi Thar Stranger" and "Lazy Rolls the Rio Grande."

Hoppy, California and Johnny come to the ranch of a friend and his daughter, disguised as dude detectives from the east, to investigate the disappearances, without a trace, of several herds of cattle.

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.

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 hires forty gunslingers to stop him. Stop Hoppy? Hah!

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.

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.

Pete Smith, a lift bridge operator in a harbor, feels lonely in his cabin, his only visitor being a policeman on patrol, Sgt. Coughlin. One night, after hearing shots, Smith gives shelter to a wounded man, whom he hides from Coughlin. Before leaving, the man, Marcas, promises to return the favor and the coat he borrows from him. Later, Smith enters the police, and his chief, Mather, suspects he is protecting Marcas, who is actually a gangster. Marcas sends a girl, Mary Monks, to deliver a luxurious coat with a fur collar to Smith. Pete and Mary get along well, and for his sake, she betrays Marcas, who is eventually shot to death by the cops, after having stopped his mob from killing Smith. Mary goes away alone into the night, and when Mather finds out that Pete is protecting her, he drops away the evidence of her presence on the spot.

Buck is a hard working lumberjack, but likes to have fun. Buck's father is the foreman and wants Buck to take over when he retires. Buck is in love with Honey, a show-girl on the carnival boat, but she won't live in a lumberjack camp.

Bill O'Brien is promoted to lieutenant in the police department for his arrest of Mike Patello, gang leader and racketeer, for murder. Ruth Dale, who loves Bill, is concerned when her brother, Johnny, who witnessed the murder, proposes to testify against the racketeer. Meanwhile, Captain Antrim informs Bill that his father has just been released from prison and does not know his son is a policeman. On the way from prison, O'Brien (J. P.) meets Limo, a former cockney pal who recognizes Bill and keeps J. P. from seeing his son; later, J. P. arrives intoxicated and is enraged, forcing Bill to knock him unconscious. J. P. is arrested for robbery but returns the loot to save his son from disgrace; Johnny is killed before testifying against Patello, who is released but confronted by J. P., who proves his guilt and, when he struggles with the police, kills him. Bill plans to resign, but confident of Ruth's love, he decides to remain on the force.

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.

Hoppy and Lucky have been called in to investigate a series of stage holdups. The robbers are taking gold from Colby's mine and Hoppy suspects it may be ex-outlaw Colby himself. When Speedy strikes gold, Hoppy borrows it and announces a gold shipment hoping to catch the gang and their leader.