Magician-turned-actor John Calvert, previously the suave leading man of Film Classics' "Falcon" series, is a curious choice to star in the rough-and-tumble western Gold Fever. John Bonar (Calvert) and grizzled old prospector Nugget Jack (Ralph Morgan) strike it rich, whereupon they are besieged by Bill Johnson's (Gene Roth) outlaw gang. Heavily outnumbered, our heroes are forced to rely on brain rather than brawn.

A bump on the head sends Hank Martin, 1912 mechanic, to Arthurian Britain, 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.