Terry Macy (Reed Howes), the son of a newspaper's founder, is assigned to investigate a mysterious warning signed '30' (newspaper term for 'The End)that has been sent to a local politician. Terry is captured at a clandestine meeting of the 'Mystic Medicants", an outlaw band, where he overhears the plans of a plot to kill his uncle, Robert Macy, publisher of the newspaper. Terry must also, according to his father's will, get married within a short period of time is he is to inherit the newspaper.

War hero flier Bob Collins goes on a war bond selling tour with two buddies, and substitute "chaperone" Ivy Hotchkiss. Bob's a cheerful Lothario with several girls in every town on the tour. After some amusing escapades, Bob and Ivy become romantically involved, agreeing it's "just fun up in the air." Then Ivy finds out the real reason why it shouldn't be anything more.

John Wyatt is a government agent sent to smash a counterfeiting operation near the Mexican border. Joining Doc Carter's medicine show they arrive in the town where Curly Joe, who once framed Carter, resides.

Jack Wade is the son of a wealthy father who runs a successful ship-building company. He uses his athletic prowess to defeat the villainous competitors who are out to financially ruin his father.

The story of one of the notorious members of the infamous Dalton Brothers outlaw gang.

Truck drivers Steve Hackett and Bill Purvis are fired from their jobs with the West Coast Trucking company for not using second-gear going down steep grades. Davis, the company vice-president, surprisingly asks them to carry a load of merchandise to Arrowhead and offers a $1000 bonus. He tells them it is a load of lettuce. Several miles out of Los Angelese, they are stopped by a mob of lettuce-farm workers on strike. When the first crate is tossed off the truck, it explodes and the two pals learn their merchandise is a cargo of dynamite. The workers let them proceed and they crash into a car driven by Mary Stevens, whom they had met at a restaurant. She and her dog, "Butch" (played by a Credited dog named Stooge), join them and they deliver their cargo, and learn unscrupulous real-estate operators have jammed the locks on the dam in order to ruin the ranchers and farmers and take over their property.

A mad scientist attempts to rule the world by creating various elaborate inventions.

Aircraft are being shot down by a large black plane with a big "X" painted on the wing. The chief suspects are invited for the weekend to an old dark mansion.

The story is motivated by a long-standing feud, which comes to a head when each of the warring families tries to adopt an orphan girl who is about to receive a huge inheritance.

When John Mason's father is killed, John is wounded. Attracted to his nurse Alice, a conflict arises between him and his friend Ben who plans to marry Alice. John later finds the killer of his father but goes to face him not knowing Ben has removed the bullets from his gun.