Advertising man Roger Thornhill is mistaken for a spy, triggering a deadly cross-country chase.
Lucky Jackson arrives in town with his car literally in tow ready for the first Las Vegas Grand Prix - once he has the money to buy an engine. He gets the cash easily enough but mislays it when the pretty swimming pool manageress takes his mind off things. It seems he will lose both race and girl, problems made more difficult by rivalry from Elmo Mancini, fellow racer and womaniser.
An alien from Venus tries to take over the world with the help of a disillusioned human scientist, as his wife, his best friend and the friend's wife try to intervene.
