A bump on the head sends Hank Martin, 1905 auto mechanic, to Arthurian England, 528 A.D., where he is befriended by Sir Sagramore le Desirous and gains power by judicious use of technology. He and Alisande, the King's niece, fall in love at first sight, which draws unwelcome attention from her fiancée Sir Lancelot; but worse trouble befalls when Hank meddles in the kingdom's politics.

Following the discovery of a doomsday machine capable of destroying Earth, the launch of a US space mission to Venus is taken over by the military.

A man believed to be dead and buried escapes from his grave and returns to the scene of the crime seeking revenge.

A reformed jewel thief fights to clear his name when he's framed for murder.

To ensure a full profitable season, circus manager Brad Braden engages The Great Sebastian, though this moves his girlfriend Holly from her hard-won center trapeze spot. Holly and Sebastian begin a dangerous one-upmanship duel in the ring, while he pursues her on the ground.

King Louis XI masquerades as a commoner in Paris, seeking out the treachery he is sure lurks in his kingdom. At a local tavern, he overhears the brash poet François Villon extolling why he would be a better king. Annoyed yet intrigued, the King bestows on Villon the title of Grand Constable. Soon Villon begins work and falls for a lovely lady-in-waiting, but then must flee execution when the King turns on him.