Young David Morton, heir to millions, has been over-zealously restrained from normal youthful activities by his two old-maid Aunts, Harriet and Agatha. In an outburst from his confinement, he meets lovely Gertrude, and promises to race her injured-brothers car in the Big Race. Between the gangsters trying to win the race by disabling him, and his bungling bodyguards trying to bring him home safely, David has a battle to win the race and Gertrude's heart.
Good-natured troublemaker "Cyclone" Tom Saunders is hired by a ranchers' association manager to investigate recent cattle rustling at one of their ranches and to see if a pair of nesters have anything to do with it. After discovering the nesters, pretty Betty Powell and her rickety old father, are incapable of rustling, Tom instead turns his attention to the huge, swaggering bully of a foreman, Nate Lenox.
An inventor develops a new type of aircraft. A crooked businessman attempts to buy it but the inventor refuses to sell it to him, whereupon the rejected businessman and his henchmen steals the plane and its blueprints. The plane's test pilot, who is the boyfriend of the inventor's daughter, and his sidekick set out to get the plane, and the plans, back.
The man Bannister has sent to investigate the trouble at his mine has disappeared. This time his son Bob goes, quickly learning that Kincade is the culprit. Kincade has been taking gold from the mine and now plans to kidnap Teresa and skip across the border.
On the mystic island of Lemuria, the cult of Ubasti seek the Egyptian Princess Nadji to sacrifice so that their goddess Ossana, whose soul resides in Nadji's body, may be resurrected by Black Magic. Nadji is located in the Far East port of Suva, but shielded by the White Magical powers of Frank Chandler, an American raised by Eastern mystics who is also known as Chandu. When Chandu takes a voyage alone, however, the evil Voice of Ubasti is able to magically spirit her to Lemuria, where Black Magic reigns supreme. Chandu sets out in pursuit with his sister Dorothy, niece Betty and nephew Bob; but, shipwrecked on the magic island, Chandu finds his family also held prisoner for sacrifice while he is plunged into an endless maze of caverns beneath the evil temple, where both his mortal and magical strength seem rendered useless.
Tobin is after the bandit Zanti who killed his parents. He finds him just as Zanti is about to kill Dusty and kidnap Ruby. Saving the two, he goes after Zanti. He catches him but Zanti escapes the Sheriff's handcuff's and this time Tobin has to chase him into the desert.
Expelled from his lieutenancy in the Marine Corps, Bill Traylor reenlists as a private. His unit is sent to a Latin American country where a rebel leader called The Torch promotes insurrection. There Traylor encounters again Captain Benton, the man responsible for his disgrace and his rival for the love of a girl.
Two military pilots are close friends, and share in a lot of hazardous missions while engaging in a series of good-natured romantic rivalries. But when one of the pilots loses a girl he really cared for, he cannot forgive his friend. Soon afterwards, they must work together on their most dangerous mission yet.
After Fred von Bergen, a German immigrant in America, is forced from his job by anti-German hysteria before the first world war, he and his friend Bob Wilson leave America and join the German air force. There, both men fall in love with ambulance driver Alida Hoffman. When America enters the war, Bob is caught between loyalty to his home country and the threat of execution for desertion and treason to Germany. It remains for his friend Fred to extricate him from the dilemma - but at what cost?
Chandu consults his crystal ball and sees that Nadji, Princess of Egypt, is in danger. She is about to be sacrificed by the black magic cult of Ubasti. Headed for the magic island of Lemuria, he is shipwrecked , washed ashore and captured. He becomes invisible, escapes and after numerous detours is able to rescue the princess.
An Easterner Inherits a cattle ranch, only to discover that thousands of cattle have been stolen. He secretly signs on as a hired hand at his own ranch to discover who's stealing them.
An action-filled film with outlaws-of-the-clouds at war with the men of the U. S. Flying Service. A young pilot, Nick Ferris, fights to track down a dangerous gang of smugglers and clear his name of an undeserved stigma.
The Marshal sends John Weston to a rodeo to see if he can find out who is killing the rodeo riders who are about to win the prize money. Barton has organized the rodeo and plans to leave with all the prize money put up by the townspeople. When it appears that Weston will beat Barton's rider, he has his men prepare the same fate for him that befell the other riders.
When Sheriff Jake sees a man at the safe and then finds the payroll gone, he trails him. Just as he is about to arrest him, the man saves his life. Still suspicious, he joins up with the man and later they learn that Melgrove, the towns leading citizen, is trying to take over the area's ranches by having his gang stop all incoming supply wagons. With the ranchers about to sell to Melgrove, the two newcomers say they will bring in provisions.
Dad Brooks is in financial trouble and needs to sell a lot of horses. But they are being rustled and needing help, he sends for Tom. Tom looks for the rustlers but eventually realizes that someone is using a wild horse to do the rustling. He finds the secret entrance used by the rustlers to hide the horses but soon finds himself a prisoner.
A World War I British Army patrol is crossing the Mesopotamian desert when their commanding officer, the only one who knows their destination, is killed by the bullet of unseen bandits. The patrol's sergeant keeps them heading north on the assumption that they will hit their brigade. They stop for the night at an oasis and awaken the next morning to find their horses stolen, their sentry dead, the oasis surrounded and survival difficult.