A Martian invader crashes his spaceship conveniently close to the workshop of a scientist who is developing an interplanetary craft. If the extraterrestrial Purple Monster can complete the rocket ship and return to Mars, he will be able to start a full-scale invasion of Earth. Good thing Craig Foster sets out to thwart the Monster’s mission!

A criminal mastermind known as The Crimson Ghost is out to steal a device called the Cyclotrode, which can short-circuit all electrical current on the planet.

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.

The Topeka Terror is a western film of 1945 directed by Howard Bretherton. The land-rush opening of the Cherokee Strip brings in its wake a scattering of outlaws and claim jumpers. Among these is a crooked promoter. Trent Parker (Frank Jacquet), and his henchmen who plan a huge swindle by compiling falsified reports, putting the claims of honest settlers into the names of various henchmen. Clay Stevens (Allan Lane), a government agent posing as a drifting cowhand, advises the settlers to organize their resistance. Ben Jode (Roy Barcroft), the gang leader, runs for sheriff so he can gain full control of the town.