Test space rockets exploding at liftoff and increased reporting of UFO sightings culminate in a direct attempt by alien survivors of a dead, extra-galactic civilization to invade Earth from impervious flying saucers, using ray-weapons of mass destruction.
Dardo, a Robin Hood-like figure, and his loyal followers use a Roman ruin in Medieval Lombardy as their headquarters as they conduct an insurgency against their Hessian conquerors.
After a demonstration of new PT boats, navy brass are still unconvinced of their viability in combat, leaving Lt. "Rusty" Ryan frustrated. After the attack on Pearl Harbor, however, Ryan and his buddy Lt. Brickley are told they can finally take their squadron into battle. The PT boats quickly prove their worth, successfully shooting down Japanese planes, relaying messages between islands, and picking off a multitude of enemy ships.
Claire Forrest seeks her kidnapped scientist father, hidden somewhere on Mystery Island. He is held and forced to work on diabolical inventions by Captain Mephisto, a costumed villain.
Pretty Girl Barbara Mededith takes over her murdered brother's crusading newspaper. She also assumes the dead sibling's identity as "The Black Whip," righting the wrongs of Crescent City very much in the manner of her famous ancestor, Zorro.
Superhero Captain America battles the evil forces of the archvillain called The Scarab, who poisons his enemies and steals a secret device capable of destroying buildings by sound vibrations.
Told in flashback, Depression-era bum Dan McGinty is recruited by the city's political machine to help with vote fraud. His great aptitude for this brings rapid promotion from "the boss," who finally decides he'd be ideal as a new, nominally "reform" mayor; but this candidacy requires marriage. His in-name-only marriage to honest Catherine proves the beginning of the end for dishonest Dan...
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 three brothers join the Foreign Legion to escape a troubled past, they find themselves trapped under the command of a sadistic sergeant deep in the scorching Sahara. Now the brothers must fight for their lives as they plot mutiny against tyranny and defend a desert fortress against a brutal enemy.
Brass Bancroft and his sidekick Gabby Watters are recruited onto the secret service and go undercover to crack a ruthless gang that smuggles illegal aliens.
A naval officer is demoted for negligence and put in command of a run-down submarine chaser with a motley crew.
David Huxley is waiting to get a bone he needs for his museum collection. Through a series of strange circumstances, he meets Susan Vance, and the duo have a series of misadventures which include a leopard called Baby.
If there was one thing that Don Juan de Marana learned from his father Don Jose, it was that women gave you three things - life, disillusionment and death. In his father's case it was his wife, Donna Isobel, and Donna Elvira who supplied the latter. Don Juan settled in Rome after attending the University of Pisa. Rome was run by the tyrannical Borgia family consisting of Caesar, Lucrezia and the Count Donati. Juan has his way with and was pursued by many women, but it is the one that he could not have that haunts him. It will be for her that he suffers the wrath of Borgia for ignoring Lucrezia and then killing Count Donati in a duel. For Adriana, they will both be condemned to death in the prison on the river Tigre.