A crazed scientist calling himself The Voice from the Sky broadcasts his voice all across the globe, and threatens to suspend all energy in the earth's atmosphere and turn day into night unless the world immediately destroys all arms and vehicles of warfare. U. S. Secret Service agent Jack Deering is sent to Arizona to investigate
Using a false accusation of unlawful land-squatting, Bill Edwards (Al Ferguson) goes to the County Seat and has Sheriff Brown to swear out a warrant against sheep-herders Marie Valerian (Neva Gerber) and her father (Silver Tip Baker. The Sheriff sends a Deputy, "Thundering" Thompson (Cheyenne Bill_, back to serve the warrant. Thompson learns that Edwards is only trying to force the Valerians to sell their sheep to him at a cheap price, and comes back without serving the warrant. This enrages Edwards who enlists the aid of a local cattleman and his hands to drive off the sheep. Thompson sets out to keep this from happening.
Horses are being rustled by outlaws known as the Hell Hounds. When the Sheriff is killed, his Deputy Yak takes over the search for the rustlers. John Lawson says Yak cannot marry his daughter until the murderer of the Sheriff is caught. But unknown to Lawson, the murderer is his own son.
Yak arrives at the Gilmore ranch where rustling has occurred. Gilmore blames a wild horse when it is actually his foreman Mays. After Yak catches and tames the wild horse, Mays gets Yak out of the way by having him arrested for murder. Mays and his men can now make one last raid.
In this movie serial Professor Sturgess invents a miraculous engine which can draw unlimited power from the atoms of the air. When the professor is killed, his daughter and her fiance must fight to keep the secret of the power engine out of the hands of evil Weston Dore and his henchmen.
Carter Holmes, master criminologist, must help the oft-kidnapped Ruth Stanhope to find the 9 daggers that will unlock the secret of the cursed Devil's Trademark!
Wealthy ranch owner Cheyenne Harry decides he needs a housekeeper, but his cowboys decide he needs a wife and advertise in an eastern newspaper. The ad is answered by Aileen Judson-Brown, as dictated by her fortune-hunting mother. Harry marries Aileen and a baby is born a year later. Deciding to gain more money and social standing, Mrs. Judson-Brown then tries to break up the marriage so that Aileen can marry Ferdie Van Duzen. Mrs. Judson-Brown steals the baby and tells Harry the baby has died and Aileen no longer loves him. Harry goes out West in sorrow, but when Mrs. Judson-Brown's butler wires Harry the truth, Harry locates the baby and discovers Aileen still loves him. The reunited family goes West together, leaving Mrs. Judson-Brown behind.
When Mrs. Harrison arrives in Harborsport for her vacation, she announces her plan to marry Gladsome, her daughter, to Vincent Bradshaw, the son of her financial advisor James Bradshaw. To keep Gladsome from socializing with the local fishermen, James drives them from his property, but they organize under her and force their way back. Arrested for rabble-rousing, Gladsome is bailed out of jail by James and later meets "Alphabet" Carter, a vacationing financial wizard, for whom she has an immediate attraction.
Optimistic in the face of failure, Daniel Webster Opp finally attains success as a traveling salesman for a shoe firm, but just when his prospects are best, he receives word that his stepfather is dead. He leaves at once to meet his brother Ben at Cove Junction, where they settle the estate according to Ben's demands. Ben takes the money, while Mr. Opp is given the homestead and custody of Kippy, his feebleminded half-sister. Sacrificing all to remain with his sister, Mr. Opp founds a newspaper, the Opp Eagle, and begins to promote the town.
Tommy Buckman, the ne'er-do-well son of dime store magnate John Buckman, is given one last chance to succeed by surveying a possible location in New England for the opening of another store in his father's chain. Arriving in the town of Winton, Tommy lands in jail and, disowned by his father, is bailed out by Nina Potter, whose father owns the only dime store in town.
A wealthy young athlete comes to the aid of a beautiful heiress, whose fortune is being threatened by two arch villains, The Great Master and Doctor Zulph.