A famous scientist invents a humanoid robot (the titular "monster"), so a greedy rival scientist plans to steal it for use in his criminal plans. His henchmen often kidnap a trained gorilla (the titular "ape") from the zoo, to aid in the schemes.
Four flying G-Men protect America against enemy spies; one of the four assumes the identity of The Black Falcon, to befuddle the saboteurs even further.
Pulp hero "The Spider" seeks to destroy all criminals. In this serialized adventure, he battles The Octopus, who intends to replace the government of the United States.
Government agents try to thwart smugglers, while some sort of plot unfolds, about a hidden treasure revealed by cursed coins.
Tom King Jr. seeks to discover who murdered his father, a Texas Ranger; the trail leads to a network of Axis spies.
Mandrake and his team attempt to prevent "The Wasp" from stealing and using a new Radium invention.
Calvin Drake employs a group of low-lifes to drive away land owners along the path of a new railroad; Red Ryder opposes this strategy.
Greedy traders have kidnapped a researcher, hoping he will reveal the location of a treasure in a hidden village. Family and friends of the researcher come looking for him. Adventure ensues.
Mystery and adventure, surrounding a stolen rubber harvest.
A team of two-fisted insurance investigators (one of whom disguises himself as The Masked Marvel) endeavor to discover and thwart the loathsome saboteur Sakima.
Kit Cardigan seeks the killer of his father...among other plot threads leading up to the famous historical incident.
Claire Forrest seeks her kidnapped scientist father, hidden somewhere on Mystery Island. He is held and forced to work on diabolical inventions by Captain Mephisto, a costumed villain.
A Martian invader crashes his spaceship conveniently close to the workshop of a scientist who is developing an interplanetary craft. If the extraterrestrial Purple Monster can complete the rocket ship and return to Mars, he will be able to start a full-scale invasion of Earth. Good thing Craig Foster sets out to thwart the Monster's mission!
Congo Bill is hired to locate an heiress lost somewhere in Africa.
The manager of The Big Circus plots to marry the owner's daughter and gain control of the outfit.
Jim Dorn endeavors to protect Jean McNain from a man she knows has committed a murder, Carter Snowden
Bob Gilmore, a young clubman, is called by telephone to his home, where his parents are giving him a birthday party. He overhears one of the men guests make a slurring remark about his mother's appearance, and proceeds to punish him then and there, throwing the entire gathering into an uproar. Later in the evening he assumes guilt for a check which had been in reality forged by his foster father, in order to save the mother's feelings, but obtains a written confession from the guilty man for future use if necessary. Learning that he had been adopted from a foundling asylum in infancy, Bob decides to go to New York to see if he cannot learn his real name, which he understands begins with "Mor."
A silent action movie serial.
A police detective is caught up in a plot to steal two million dollars in bonds.
Dr. Ernst Grood , having already dominated the planet Ergro, now intends to take over the control of the Earth. Unfortunately for him, reporters oppose his sinister designs.