A group of street kids battle a terrorist gang led by a Japanese spy.

Police detectives battle the League of Murdered Men, a gang of resurrected dead criminals.

An evil scientist known as "Mr. M." uses a drug he has developed called "hypnotreme" to help steal submarine equipment. Federal agent Grant Farrell is dispatched to find the mysterious villain and stop his nefarious plans.

Dr. John Meredith has been driven from civilization by the criminal activities of his twin brother Bradley Meredith. With his infant daughter, he settles in the African jungle, where his ability to cure the native ills has resulted in his virtual control of the Masamba tribes, who possess vast diamond mines coveted by a gang of crooks. They use Shamba, a witch doctor jealous of Dr. Meredith's influence over the tribe, to further their schemes. They lure Dr. Meredith away from the jungle, and he is murdered by "Slick" Latimer. The natives believe that a sacred amulet is the secret of Dr. Meredith's power, and Shamba attempts to kill Nyoka, Meredith's now-grown-up daughter, to obtain the amulet (which actually contains the secret to the entrance of the Caves of Nakros). Jack Stanton rescues her and assists her in her efforts to recover the amulet. Latimer works with Shamba, and with Bradley Meredith, who poses as his murdered-brother so successfully that even Nyoka does not realize the deception.
American, British and Chinese secret agents battle the Japanese Black Dragon Society, a secretive ring that smuggles enemy agents into the U.S. disguised as mummies.
Foster (Charles Miller (IV)', owner of the local stagecoach line in Canyon City in the 1880s, has received a Federal Franchise Commission grant and is rushing to complete a new road through the lawless Comanche Strip with the aid of his daughter, June (Kay Aldridge), and his construction foreman "Red" Kelly (Eddie Acuff). Unbeknownst to them, their supposed friend, land-and-cattle dealer Martin Dexter (Robert Frazer), and the town lawyer, Silas Higby (Ted Adams), have plans of their own; should Foster's road see completion, homesteaders would occupy the strip and ruin Dexter's plans to buy the 500,000 acres for cattle-grazing land. Dester hires a band of renegade Indians to attack the road crew. Indian scout Jim Brady (Budd Buster)sees a supply wagon driver by "Red" and June being cased by the renegades, alerts the work-camp crew and then rides to summon Captain Duke Cameron (Allan Lane) and his U.S. Cavalry troop but, before they arrive, Foster has been killed along with many of his workmen. Cameron, a long-time friend of the Foster family, later requests his commanding officer, Colonel Andrews (Stanley Andrews) for a furlough to aid June in continuing her father's project. He then seeks to find out who is behind the renegade attack and, eleven cliffhangers later does so in the final chapter of this 12-chapter serial.
Dick Tracy goes up against a villain known as The Ghost, who can turn himself invisible.
Wild Bill Tolliver and Missouri Benson ride into the territory of New Mexico to search for Bill's father, Henry Tolliver, who disappeared while prospecting. They discover that a ruthless outlaw leader, Jonathan Kincaid, has joined forces with Carl Engler, a renegade European general, and Kincaid owns a giant gold mine and uses captured Mexican patriots, and others, to work as slaves on his property. Bill and Missouri become friendly with Consuelo Romeros, an agent for the Mexican government, and they learns that Bill's father is among the prisoner/slaves in the mine. After freeing his father, Bill sets out to smash both the slave-mine operation and Engler's attempts to overthrow Benito Juarez, the legal president of Mexico.
Miserly old Anton Benson once recovered a treasure in gold from a sunken Spanish galleon, and in his greed murdered anyone who got in his way of keeping it. Now his family is gathered at his estate, Bensonhurst, and they are all searching for the treasure, which is hidden somewhere on the estate. Also looking for the gold is a masked killer called The Iron Claw, who murders one member of the family and lets the others know that they'll be next.
Alan Armstrong, aka Spy Smasher, battles a Nazi villain known as The Mask, who heads a gang of saboteurs determined to spread destruction across America.
The chapter-crunched version of this 196 minutes, 12-episode serial from Republic finds Canada being bombed mercilessly by a mysterious-enemy plane (shaped like a boomerang) called the Falcon, under the supervision of Admiral Yamata, Count Baroni and Marshal von Horst, chiefs of the Axis Fifth Column in Canada. No one can identify the plane until American inventor, Professor Marshall Brent, and his daughter Carol arrive with a new type of airplane detector. This poses a threat to the Axis chiefs in preparing western Canada for an invasion and they have him kidnapped by local Quisling Gil Harper. RCMP Sergeant Tom King attempts to rescue Brent, but the inventor is killed when a plane in which he is held captive crashes into a riverboat. Carol, determined to carry on her father's work and with King's aid, manages to prevent the enemy agents from capturing the detector, and destroys the device (many chapters later) when the agents make a last desperate attack on the cabin where it is hidden. She is captured and taken to the crater of a volcano, where the ring makes its headquarters.
A sea captain about to be hanged for a murder he didn't commit is rescued from the gallows by two of his crewmen. They head for the island of Pulinan, where they believe the real murderer--the captain's former partner--is hiding so the captain can clear his name. As it turns out, their troubles are only beginning.
Greedy oil speculators, led by Morgan, are trying to force Tiger Woman and her band of warriors from their jungle home. Allen Saunders of Inter-Ocean Oil wants to develop the oil, too, but fights with Tiger Woman to stop the bad guys.
Mountie sergeant and his three constables find themselves facing multiple perils at the hands of an outlaw gang which, aided by a corrupt Indian medicine man and his followers, have brought a halt to construction of a key railroad line through the Canadian Northwest.
Reporter Brenda Starr (Joan Woodbury) and her photographer Chuck Allen (Syd Saylor) get involved in a search for the loot from a payroll robbery. Cliffhanging action and adventure and a fair amount of comic relief follow them at every turn.
Government agents battle a gang of Nazis who are trying to use the Orotron machine, which can turn seawater into gold.

A police detective goes undercover and joins a gang of Nazi agents using explosive gases and artificial lightning to sabotage the war effort, whom he battles in disguise as The Black Commando.

The evil and masked "Gargoyle" is sabotaging all of America's industrial plants. It is up to the Spider to save the country.
It's intrepid Nyoka and her friends versus Vultura, Queen of the Desert, on a quest for the Golden Tablets of Hippocrates.
White Eagle was raised by Indians after his father, a US army officer, was killed in an Indian raid. He believes that the Indians and the white settlers can live together and works towards that goal, but a gang leader who has his own reasons for not wanting peace between the two groups sets out to stir up as much trouble between them as he can.

Tom King Jr. seeks to discover who murdered his father, a Texas Ranger; the trail leads to a network of Axis spies.

Secret Service Major Steel (Joseph W. Girard), is one of the few men in America aware of the fact that Captain Albright (Dave O'Brien) is also Captain Midnight, daring masked aviator dedicated to fighting gangsters and enemies of America. When murderous bombing attacks are made on West Coast munitions plants, Steel sends for Albright and asks him to track down the mysterious Ivan Shark (James Craven), the foreign agent mastermind behind the attacks. Shark has learned about an ingenious range finder, invented by John Edwards (Bryant Washburn, and makes plans to obtain a model of the invention. Edwards instructs his daughter, Joyce (Dorothy Short), to bring the model to Albright for safekeeping in his mountain laboratory. Shark takes Edwards prisoner by Albright assures Joyce that her father will be saved and an end put to Shark's reign of terror. Dressing as Captain Midnight and enlisting the aid of his friends, Chuck (Sam Edwards) and Ichabod Mudd (Guy Wilkerson), Captain Midnight delivers on his promises fourteen chapters later.

An American secret agent travels to Africa to infiltrate a Nazi spy ring.
A mysterious detective called The Masked Marvel battles Japanese saboteurs intent on blowing up America.
Crime lord Jim Belmont escapes FBI custody and begins a reign of thievery that is thwarted at every turn by Jerry Blake, the FBI's Operator 99.
Mine owner Jackson Decker orders his manager to obtain Tom Bailey's milling machinery no matter what the cost. When Bailey is found murdered, suspicion naturally falls upon the mine owner and his son, a Canadian Mountie, is ordered to find the real culprit. He joins forces with a French-Canadian constable, Bailey's beautiful daughter and a phony palm reader to learn the truth and discovers a secret gold mine, a double-crossing casino owner and a forger at the bottom of the conspiracy.
At the Bainbridge Research Foundation, Professor Franklin Arnold, displays his creation, the Metalogen Man, a robot, to Professor Ernst and three other colleagues. Shortly afterward, the three associates are killed by Thor (Ray Corrigan, in his for-rent ape suit), a huge ape trained by Ernst, and Arnold, his daughter Babs and Ken Morgan, a representative of the company for whom the robot was made, find it has been stolen. Their 15-chapter search for Thor, the robot and Ernst leads to a series of cliff-hanging adventures as Ernst strives to gain control of the robot and the supply of metalogen needed for its production.
Evil Hassan slips back into his native land of Ahad and plots to overthrow his twin bother, Kasim, who has just been crowned the Caliph. Hassan enlists the aid of the chief Chamberlain, Faud and they send several henchmen into the royal palace, who then knock Kasim unconscious. Faud and Hassan dispatch a couple of different hirelings to take Kasim into another part of the town and murder him.Kasin comes to and gets away, but has been wounded. Omar, a beggar, takes Kasim to his home and nurses him back to health. But, it takes a few weeks for Kasin to get healthy and, by that time, Hassan has a firm grip on the duties of a Caliph. In a storeroom, Kasim finds a coat of mail with a great hawk emblazoned across the chest and promptly decides this is the costume he will wear while fighting to get his old job back. Meanwhile, the Emir of Telif shows up with his daughter, Princess Azala, with the intent of marrying her off to the local Caliph. They do not know that the current-Caliph on the royal-throne is the evil twin-brother of the man they think he is.

Buck Sherman and Jake Jackson, a couple of evil carpetbaggers, illegally enter a Navajo reservation to prospect for gold and end up killing Aranho, the Navajos chief. Black Arrow, presumed Aranho's son, refuses to kill the Indian agent, Tom Whitney, in revenge, as demanded by Navajo law. Then, he is driven off the reservation for his reluctance to kill Whitney and decides to join forces with Pancho, Mary Brent and the agent to go in search of the men who killed the chief.

A Martian spacecraft crash-lands near the observatory of Cyrus Layton, designer of Earth's first spaceship. The survivor, forerunner of an invasion, can assume the form of any earthman. Calling himself the "purple monster," the humanoid invader sets about gaining control of Layton's rocket project. Opposing him is Craig Foster, former Secret Service man, who episode by episode tries to thwart the monster's attempts to acquire rocket components. Will Craig ever suspect that his closest associate is really the monster?
Walter Calvert (Davison Clark) calls upon his brother Henry (Davison Clark) at his eerie old house and demands a share of the family fortune, and threatens to kill Henry if he doesn't get it. A few days later Henry's car goes over a cliff and he is presumed dead. Bob Stewart (Robert Kent, a detective whom Henry asked to investigate the matter if he should die, starts his investigation and Duke Ellis(Tim Ryan, a newspaper reporter friend is with him. Bob meets the family at their mansion and questions Henry's sister, his half-brother, his nephew and his nephew's bride, and Ruth Allen (Amelita Ward), whose father was in business with Henry. Henry's brother Patton (Charles Middleton) and a shadowy figure known as The Voice (NO, not the Narrator)plan to kill all the relatives and divide the fortune. As the murder attempts multiply, Bob, Ruth and Duke endeavor to track down the masterminds and bring them to justice.
Girl looking for father who disappeared years before in a jungle, finds herself battling greedy civilized people and savages alike.

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