A western town is being overrun and ruled by a gang of outlaws led by Bart (John Merton). Former Ranger Tim (Tim McCoy) is called out of retirement and assigned to clean up the gang. He disguises himself as a Mexican bandit, joins the gang and works from within.

The Florida Keys in 1840, where the implacable hurricanes of the Caribbean scream, where the salvagers of Key West, like the intrepid and beautiful Loxi Claiborne and her crew, reap, aboard frail schooners, the harvest of the wild wind, facing the shark teeth of the reefs to rescue the sailors and the cargo from the shipwrecks caused by the scavengers of the sea.

A magazine reporter exposes a crooked District Attorney, resulting in his trial. Complications ensue, however, when the man is acquitted.

Lil becomes a dealer in a gambling casino in order to get the information she needs to clear her father of a murder charge. She also falls in love with lawyer Brewster.

The Canadians have discovered a valuable substance called Compound X, which can cure infantile paralysis. When a country at war with Canada learns that Compound X also contains magnetic properties that could aid them in their warfare against the British, they send agents to infiltrate Canada and steal a large quantity of the substance. It's up to Sgt. King (Allan Lane) and his Mounties to track down the agents and put an end to their scheme.

The nefarious Dr. Fu Manchu searches for the keys to the tomb of Genghis Khan, in order to fulfill a prophecy that will enable him to conquer the world. His nemesi, Dr. Nayland Smith and his associates fight to keep the evil doctor from getting his hands on the keys. In 1943 the serial was edited together into a feature movie also called Drums of Fu Manchu.

In this light and lovely romantic musical, a Hungarian woman attends a Viennese fair and buys a card from a gypsy fortune teller. It says that she will meet someone important and is destined for a happy marriage. Afterward she gets a job as a baker's assistant. She then meets a handsome army drummer who secretly dreams of becoming a famous composer and conductor. Unfortunately the military forbids the young corporal to create his own music. But then Ilonka secretly sends one of the drummer's waltzes to the Austrian Emperor with his weekly order of pastries. Her act paves the way toward the tuneful and joyous fulfillment of the gypsy's prediction.

A group of adventurers head deep into South American jungle in search of an ancient Incan treasure.

Texas Ranger Dusty Rivers ("Isn't that a contradiction in terms?", another character asks him) travels to Canada in the 1880s in search of Jacques Corbeau, who is wanted for murder. He wanders into the midst of the Riel Rebellion, in which Métis (people of French and Native heritage) and Natives want a separate nation. Dusty falls for nurse April Logan, who is also loved by Mountie Jim Brett. April's brother is involved with Courbeau's daughter Louvette, which leads to trouble during the battles between the rebels and the Mounties. Through it all Dusty is determined to bring Corbeau back to Texas (and April, too, if he can manage it.)

During a test, a race car using an experimental oil fueled engine blows up, killing the driver. Lucky Taylor, a stunt driver, is initially blamed for the accident, but is later cleared. He thinks the engine design has a real chance to win races, but the racing association has banned it since the accident. He devises a scheme to have a car equipped with the engine entered into a race, without race officials-- or the engine designer's sassy daughter -- finding out about it.