A newly hired police chief vows to clean up a notoriously corrupt police department. When he is murdered, investigators find that there is no shortage of suspects, most of them being fellow cops.

Perrin is a cowboy who comes to the aid of local Indians being swindled out of their gold. He signs on as a ranch foreman, but learns the ranch is the home of the crooks.

Rin-Tin-Tin brings the killer of his mistress to justice.

Good-natured troublemaker "Cyclone" Tom Saunders is hired by a ranchers' association manager to investigate recent cattle rustling at one of their ranches and to see if a pair of nesters have anything to do with it. After discovering the nesters, pretty Betty Powell and her rickety old father, are incapable of rustling, Tom instead turns his attention to the huge, swaggering bully of a foreman, Nate Lenox.

Fired from the force, a cop attempts to solve a string of truck holdups.

Funds are embezzled and a fur trapper is murdered. Rin Tin Tin to the rescue!

An inventor develops a new type of aircraft. A crooked businessman attempts to buy it but the inventor refuses to sell it to him, whereupon the rejected businessman and his henchmen steals the plane and its blueprints. The plane's test pilot, who is the boyfriend of the inventor's daughter, and his sidekick set out to get the plane, and the plans, back.

When Morley has his own bank robbed, Tom tries to break it up. Mistaken for one of the gang, he is caught and sentenced to a chain gang. His girlfriend Peggy then sets out to prove his innocence.

The Millionaire Kid is young Tommy Neville whose wealthy parents, Thomas and Gloria Neville are preparing to fight it out in divorce court.Tommy runs away from home. The private detective assigned to watch him tells Mrs. Neville he has been kidnapped. She immediately suspects her husband. Meanwhile, Tommy is selling newspapers in another city. He is attacked by a bully, and is rescued by gangster Terry Mallon and his daughter Kitty. Unaware of his identity, they take him to their beach home. Reporter Breezy Benson is sent to interview Mrs. Neville about the divorce, and is fired when she won't talk to him. He meets Kitty at the beach and is intrigued by her. He meets her father, who is curious but not suspicious as news of the alleged kidnapping has not been reported.

Tom Hilton and Stub Macey are heading out to the Jergenson ranch to buy his cattle. However, Jeckyl and Sheriff Slater control the cattle market that forces the ranchers to buy at their price, and they are determined to keep the newcomers out.

Perrin and his partner get paid a big sum of money at the end of their cattle drive. Shortly thereafter, the partner is found with a knife in his back and Perrin is blamed for the murder.

A sailor finds an ancient vase on an uncharted island. He is later hired by archaeologists to lead them back to the island. They discover the temples of a lost civilization.

Tom Henderson is made Sheriff of Chico to fight Slim Walker's gang. Unknown to Tom, banker Luke Hargrave is the gang's real boss. Dad Kane is looking for the man that blinded him whom he can remember by his voice. He finds him when the gang robs the bank and Tom chases them down.

When Clay Morgan kills Joel Potter, Marshal Manning has to arrest the brother of the girl he plans to marry. When the Morgans effect Clay's escape, the Potters take Ann Morgan as a hostage. Manning is now caught in the middle and the two sides are about to fight it out.

The man that framed Tom Lansing's father for murder is at a ghost town where no one is allowed in or out. Tom gets in by posing as an escaping outlaw with his sidekick Banty posing as the Sheriff that is chasing him. Tom learns that the boss Cramer is the man he is after but there is trouble when Banty later gets caught. Cramer holds a kangaroo court planning to kill Banty if he doesn't tell who his confederate is.

The Rangers are after Travis. When Tom catches three of his gang members, he gets Jimmy to go straight and lead him to Travis where he hopes to join the gang. But Tom is in trouble when Pat...

Bolton has organized a feud between the Rork's and the O'Neil's. He has rustled cattle and killed a man putting the blame on Danny O'Neil. Tom Rork has found a bullet with markings on it that he hopes will clear Danny.

A fur trapper catches another trapper trying to steal his furs. He stops the thief, but later on the furs are stolen anyway. Rin Tin Tin Jr. tracks down the thief to try to get the furs back.

A young man gets mixed up with a stolen necklace and a gang of ruthless jewel thieves.

After a night of gangster terrorism in a large metropolitan city, the police haul in some of the perpetrators. The Evening Gazette runs the headline that financier Roger Renfrew will head the City Reform League in a fight to clean up city politics. The article states that a reign of unchecked gangster terrorism has shaken the city administration to its foundations and caused the resignation of the chief of police. The Gazette editor, Madison, claims he played no small part in getting Renfrew appointed. Madison is actually being controlled by crime boss Brad Franklin, who also gives orders to the timid Renfrew. With Renfrew in office, Franklin is confident that the city is now completely in his control, and he doles out gambling, slot machine and lottery rackets to his henchmen. Madison and Franklin are conspiring to eliminate The Daily Press , the Gazette 's rival newspaper, which is run by honest newsman John Parker. The Press missed the Renfrew story because Franklin's men had threatened spineless city editor Stanley, and he had taken fearless, animated cub reporter Dick Laurence off the city hall beat. When Parker reads the Gazette 's story, he is outraged, and chastises Stanley, who blames Dick. After Dick returns to the newsroom with fake handcuffs and a water pistol and uses them on Stanley, he is fired. When Parker asks Dick why he did not cover the story, he tells him that racketeers are running the reform league and Madison is in league with them. Anxious to prove that the press cannot be manipulated, Parker assigns Dick the reform league story and promises him a raise and a bonus if he succeeds. Dick eagerly promises to get Renfrew's resignation. Stanley calls Renfrew to clear himself from any association with the Press 's reporting. Dick's girl friend, May, who also works for the Press , listens to Stanley's call from an adjoining phone booth and upbraids him for being a coward. When Dick visits Renfrew's office, two of Franklin's men accost him, but he bests them, handcuffs them with his fake cuffs, and takes their photograph. May has followed with a policeman, and when Renfrew denies any connection with the hoods, they announce that Franklin is behind him. Fearing retaliation from Franklin for failing to back his men, Renfrew calls Madison, who advises him to meet Franklin's henchman, Edwards, who will lead Renfrew to Franklin's secret apartment. Dick listens in on the telephone conversation and tails Renfrew by jumping through the window into a truck, and taking the place of Frank, Renfrew's chauffeur. After driving Renfrew and Edwards to Franklin's apartment, Dick tricks the porter into divulging the secret number of Franklin's room. As Franklin introduces the timid Renfrew to the girls at his gin party, Dick tells a woman in the apartment above Franklin's that he is a telephone repairman and sneaks out on a ledge to take photographs of the illicit gathering. Renfrew notices the reporter at the window, but Edwards and his men fail to capture Dick. Returning to the newsroom, Dick develops a photograph of Franklin and Renfrew seated on a coach with two women and shows them to Parker. Parker recognizes Franklin as Chuck Ballard, Public Enemy #2. Edwards and his hoods hold up the office and take the photo and negatives, unaware that Dick had already made extra prints. Swinging out the window by a rope, Dick jumps onto the back of the gangster's car as it pulls away. At Franklin's headquarters, Dick is captured, but he escapes when they bind him with his own trick handcuffs. Renfrew receives a copy of the photo from Dick, who has demanded his resignation to prevent its publication, and he telephones to concede. Stanley takes the call and goes to Renfrew's office, hoping to upstage Dick. Renfrew announces his resignation to Madison, who calls Franklin, and as Renfrew writes out his resignation for Stanley, all convene at Renfrew's office. By having his men ruffle Stanley, Franklin hopes to intimidate Renfrew into not resigning. Dick, who has imprisoned two of the gangsters in the back of a van, arrives and knocks out Franklin's chauffeur. He then enters the office and pulls a gun on the group, ordering Stanley to disarm them. When he shows the group the photograph, Madison and Renfrew are astonished to learn that they have been cooperating with Chuck Ballard. Dick telephones Parker with the scoop that he has captured Ballard, and Parker hands the phone to May for dictation. Assured of a bonus from Parker, Dick asks May to get a marriage license with him that afternoon, but gives himself away when he accidentally squirts his water pistol. A fistfight ensues, which Dick wins single-handedly. After the police arrive, Parker and May come to the scene. When Dick proposes to May, Parker offers to pay for their honeymoon.

Tom Riley and sidekick Windy arrive at the Baker ranch where horses are being rustled. It appears the culprit is a wild horse, but Tom catches and rides the horse which leads to trouble with the real rustlers.

Dad Brooks is in financial trouble and needs to sell a lot of horses. But they are being rustled and needing help, he sends for Tom. Tom looks for the rustlers but eventually realizes that someone is using a wild horse to do the rustling. He finds the secret entrance used by the rustlers to hide the horses but soon finds himself a prisoner.

Jack rides into trouble when he meets up with Bill Meeker and his outlaw gang. Rescued from the gang's clutches by Don carlos, he joins forces with Carlos and with the help of Lolita who learns of the gang's next raid, they go after the culprits.

Bud has sent for a mail order bride but so has Ben and Ben used Bud's picture. When the two girls arrive at the same time, Bud is in trouble and fakes being crazy which gets him thrown in jail. With his boss in jail, Sam sees a chance to sell Bud's cattle and run with the money.