"The Octopus," a masked crime lord, is bent on crippling America with a wave of terror. He demands tribute from railroad magnates and other captains of industry. Richard Wentworth (Warren Hull), an amateur criminologist who is friendly with the police and is secretly "The Spider," a masked vigilante, is equally determined to destroy the Octopus and his gang. Pleasant and smiling in civilian life, Wentworth is frequently ruthless as The Spider, using his two .45 automatic pistols against any public enemies who attack him.
Newspaper publisher Britt Reid, secretly The Green Hornet, and his Korean valet Kato investigate and expose several seemingly separate rackets. This leads them into continued conflict with the Chief, the criminal mastermind behind the Syndicate and the individual crimes.
Governor Bronson, who raised Wayne from childhood after the death of his parents, is killed at the hands of a world-domination-seeking mad scientist called Doctor Satan. Fearing his death might be at hand, as it has been for everyone else who had opposed the Doctor, the Governor first confides in Wayne with a secret about his past. Bob's father was really an outlaw in the Old West, who fought injustice while wearing a chainmail cowl and leaving small coiled copper snakes as his calling card.
Wealthy publisher Britt Reid and his trusted Asian servant disguise themselves as the vigilantes; The Green Hornet, and his faithful servant, Kato as they battle the growing power of a ruthless Crime Lord Boss Crogan and his varied rackets across the city. All of which have strong links to foreign powers...
Amateur criminologist Richard Wentworth, formerly the masked vigilante, The Spider, brings his former alter ego out of retirement for 15 action-packed chapters to help his old friend, police commissioner Kirk (Kirkpatrick in the pulp novels), battle a dangerous, power-obsessed maniac called The Gargoyle. This mysterious crime lord and his henchmen threaten the world with acts of sabotage and wholesale murder in an effort to wreck the U. S. national defense.
In the The Masked Marvel, a hero dressed in a business suit and a face mask fights the Japanese saboteur Sakima and his espionage organization. The hook of the story is that, in a reversal of the common serial "Masked Mystery Villain" stock character, the audience doesn't know who the hero is until the final reel - all the audience is told is that The Masked Marvel is one of a group of special investigators (the same plotline is used in the Republic serial The Lone Ranger).
A chimney sweep disguises as a Spring-heeled Jack-like figure during the Nazi occupation. The heroic and mischievous black-clad "Springer", with a mask fashioned out of a sock and defying the curfew, is capable of performing fantastic leaps due to having couch springs attached to his shoes. He taunts the occupying German army sentries and the Gestapo before escaping in a surrealistic, slapstick chase across the darkened city.
A man returning home after having fought in the Civil War discovers that corrupt politicians have taken over the county and are terrorizing and shaking down the citizens. He dons the costume of his ancestor, the famous Zorro, and sets out to bring them to justice.
The Vigilante, a masked government agent, is assigned to investigate the case of the "100 Tears of Blood", a cursed string of rare blood red pearls sought by a gang led by the unknown X-1 that may have been smuggled into the country.
In Neo-Gotham City, the Joker mysteriously resurfaces after having disappeared 35 years ago, taking over a faction of the criminal gang Jokerz. On his orders, they steal high-tech communications equipment. Despite the intervention of Terry McGinnis (Bruce Wayne's successor as Batman), the Joker escapes. Bruce insists that the Joker must be an impostor, claiming to have witnessed the Joker's death after their last battle. Unwilling to let Terry face the Joker—impostor or not—Bruce demands that he return the Batsuit. The Joker attacks Bruce in the Batcave, leaving him for dead. Terry, after fending off an attack from the Jokerz, finds Bruce near dead from the Joker's trademark toxin and quickly administers an antidote, tending to Bruce with the help of Barbara Gordon, who is now the commissioner of the GCPD.
A girl is about to inherit a fortune, but she is missing in Africa. Only then, family charges Congo Bill, an adventurer, to find her, and bring her back to civilization. He follows a legend about a mysterious White Queen, but his path is full of difficulties, by an inhospitable jungle, and the man who will lose the fortune if the girl is found alive...
The Dynamic Duo face off against the Wizard, a hooded villain with an electrical device which controls cars and a desire to set challenges for the Dynamic Duo, whose identity remains a mystery throughout until the end.
It's 1865 and the telegraph is heading west. George Crane, wanting to keep law and order out of his territory, is out to stop the construction. One of the main engineers on the job is Ken Mason, the grandson of the original Zorro. As Crane hires his men to stop the work, Mason finds himself in the legendary role his ancestor originated.