A mysterious plague, the Purple Death, ravages the earth. Dr. Zarkov, investigating in his spaceship, finds a ship from planet Mongo seeding the atmosphere with dust. Sure enough, Ming the Merciless is up to his old tricks. So it's back to Mongo for Flash, Dale, and Zarkov.

A visiting American engages in a bold business promotion, the likes of which the British have not seen.

Hoppy, Johnny and California go to Arabia to buy some horses. There they get involved with a sheik and a harem and a kidnapping plot.

The sawmill owner Ramin disappears from one day to the next. Concerned, his family learns from the bank that he wrote a check to an agent named Frisch. He supposedly wanted to use it to buy a good. However, that did not happen. When Ramin's body is found, the police stumble upon Ursula von Tweel, who knew the dead man.

Sandy Vantine and her uncle, Paul Vantine, return from Europe with an antique cabinet purchased during their trip. Jim Moore, a reporter who had met Sandy and fallen for her during the voyage, suspects something odd about the cabinet. His suspicions are confirmed when people who have touched the cabinet mysteriously die. Jim and Sandy set out to solve the mystery before anyone else can become a victim.

An ordinary Viennese taxi driver, Toni Kowalski, wanders into a diner, where a singing competition is taking place, and decides to take part in it. He is recognized as a maverick, the owner of an amazing voice, and is awarded the victory in the competition. Toni is patronized by an influential socialite.

In 1939, a group of Finnish soldiers defend the border from Russian invaders.

Passengers bound to an African copper mine at Karanga to quell a native uprising encounter murder and intrigue on the way.

Because Thornwood's portraits of comely model Sally Dennis are in such great demand, he is obliged to spend virtually all his time with Sally, which prompts Toni to seek retribution in divorce court.

Taxi driver Jim befriends Ruritanian child King Ludwig while the latter is on a visit to London. A plot is afoot by sinister forces to kidnap Ludwig, and Jim becomes caught up in the drama. After the child is abducted Jim uses all his ingenuity, including cross-dressing as a Countess and becoming involved in a car chase, to rescue him from his captors.

The confrontation between two women - a choreographer of a successful troupe and a prima ballerina. Stung by the news of her upcoming dismissal, the prima begins to scheme..