Cowboy Larry O'Day and his sidekick Lucky Smith happen upon a distraught Barbara Hartwell, who is about to be arrested for the murder of her uncle. With Barbara behind bars, Larry is determined to find the real killer and soon finds himself in the middle of a mystery involving crazed German entomologists and a smuggling ring bringing Chinese "picture girls" across the Mexican border for sale to wealthy Chinese bachelors.
In 1620s France, dreaded swordsman Gil de Berault returns from carrying out a mission for Cardinal Richelieu, and finds the Cardinal worried about growing opposition from the Huguenots in the south. The Cardinal also warns de Berault that dueling has been outlawed, and will henceforth be punishable by death. Gil, however, promptly disobeys the law and is indeed sentenced to death. The Cardinal offers to cancel the sentence if de Berault is able to capture the duke who is organizing plans for an uprising. Gil travels to the duke's castle and is allowed to stay as a guest, but the duke's wife and sister immediately suspect that he is a spy. He and his servant still make good progress, until he falls in love with the duke's sister, which complicates everything.
Two boys – the prince Edward and the pauper Tom – are born on the same day. Years later, when young teenage Tom sneaks into the palace garden, he meets the prince. They change clothes with one another before the guards discover them and throw out the prince thinking he's the urchin. No one believes them when they try to tell the truth about which is which. Soon after, the old king dies and the prince will inherit the throne.
British diplomat Robert Conway and a small group of civilians crash-land in the Himalayas, where they are rescued by the inhabitants of the hidden, idyllic valley of Shangri-La. Protected by the mountains from the world outside, where the clouds of World War II are gathering, Shangri-La provides a seductive escape for the world-weary Conway.
Drummond manages to save a woman from jumping in front of his car but she runs away with his car. He traces her and she asks him to help her out of a dangerous situation.
Chin-Ching gets lost in Shanghai and is befriended by American playboy Tommy Randall. She falls asleep in his car which winds up on a ship headed for America. Susan Parker, also on the ship, marries Randall to give Chin-Ching a family.
A singer in Shanghai looks exactly like a missing flyer who went missing, and is feared to have sold the experimental airplane that he was flying. Foreign gangsters, the missing flyers girlfriend, and the U.S. military wants him, dead or alive.
The Commandant is making life rough for the colonials in Spanish California. While trying to help, Zorro is charged with the murder of the new Governor, but in the end he triumphs over the evil Commandant.
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.
Christopher Powell is in Malaysia with his fiancée and her father, capturing wild animals. While out hunting, he is attacked by a tiger, and his native guides run away, leaving him for dead. But the tiger is the pet of Ulah, a beautiful young woman who grew up by herself in the jungle. She rescues Chris and takes him back to her cave, where she nurses him to health and falls in love with him. When he eventually returns to camp, she follows. The fiancée is jealous, and the natives don't like Ulah or her pet tiger either, all of which leads to a lot of trouble.
White hunter Captain Fry tries to take Tarzan back to civilization, caged for public display. He arrives in the jungle with Jane's cousins, Eric and Rita, who want Jane's help in claiming a fortune left her.
In 1853, as the British and Russian empires compete to gain and maintain their place in the dreadful Great Game of political intrigues and alliances whose greatest prize is the domination of India and the border territories, Major Geoffrey Vickers must endure several betrayals and misfortunes before he can achieve his revenge at the Balaclava Heights, on October 25, 1854, the most glorious day of the Crimean War.
When Brent Halston returns he finds his father in an insane asylum and Wilton about to foreclose on their ranch and bring sheep onto the cattle range. When Wilton kills a rancher, Brent is blamed and jailed. Escaping jail he gets Ware to confess that he payed to have Halston committed. He then gets unexpected help from Ethel Gordon when Wilton tries to foreclose.
A white authoress, looking for a story in the outback, is kidnapped by an Afghan slaver, betrothed to a white jungle-man, and menaced by a jealous half-caste rival, a hostile witch-doctor, his crazed-killer son, and opium smugglers!
Cossetted and bored, Barbara Barry is finally sent off to school by her busy if doting widowed soap manufacturer father. When her nurse is injured en route, Barbara finds herself alone in town, ending up as part of radio song-and-dance act Dolan and Dolan sponsored by a rival soap company.