When Professor Marsh disappears while searching for the lost city of Lukachukai, his daughter enlists the help of the Three Mesquiteers.

Twenty-two years earlier Kirk Dean murdered his brother Fred Dean Sr. Now Fred Dean Jr. is looking for his father's killer. Unknown to Fred, Bill Barton who now works for Kirk, witnessed the murder.

Drummond's girlfriend is kidnapped by his enemies and he along with his friend Nielsen, an inspector from Scotland Yard, follow the trail and try to rescue her from the kidnappers.

A 14-episode serial in which Mala, a Polynesian in the employ of U.S. Intelligence investigates sabotage on Clipper Island. A gang of spies causes the eruption of a volcano, for which our hero is blamed. He convinces the local Princess Melani of his innocence and helps her ward off a takeover by rival high priest Porotu.

Young Englishman inherits ranch which he wants to sell, but Gene's gonna turn him into a real westerner instead. When new owner Spud arrives from England, Autry convinces him not to sell the ranch but to raise horses for the Army. When both Autry's and Neale's bids are the same, the Colonel calls for a race to decide the winner. But that night Neale has Autry's stable burned.

After the death of a United States Senator, idealistic Jefferson Smith is appointed as his replacement in Washington. Soon, the naive and earnest new senator has to battle political corruption.

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.

When Bob Dillon finds gold, Reed kills him. Bob's brother Jim arrives to investigate his death. Avoiding the attempt on his life by Reed's gang, Jim confronts Reed's partner Jenkins. When Jenkins flees on Jim's horse, Reed mistakenly shoots his partner. Unable to get Jim with bullets, Reed blames the murder on him and when the Sheriff jails Jim it looks like he will soon be be hung.

Egyptologist, Dean Lambert, accused of car-theft, skips bail and begins a cross-country trek to join a group in New York headed for Egypt. With the police close on his trail he gets in and out of scrapes along the way.

With the Government Remount Service unable to meet it's quota of horses, Marshal Fred Martin arrives to try and find the rustlers. Apparently just a singing cowhand dressed in white, he becomes the masked Two Gun Troubador dressed in black when he goes after the outlaws. He quickly learns Tex Walters is the leader of the gang but he must find out who is the big boss that gives Walters his orders.