Long before he became producer/director of The Tonight Show, Fred DeCordova helmed the Universal meller Illegal Entry. Howard Duff, who later worked with DeCordova on the TV series Mr. Adams and Eve, stars as Bert Powers, an undercover agent for the U.S. Department of Immigration. While attempting to bring a vicious gang of alien smugglers to justice, Powers falls in love with Anna Duvak (Marta Toren), a gang member who is Not What She Seems.
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.