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 fiancรฉe Sir Lancelot; but worse trouble befalls when Hank meddles in the kingdom's politics.
Connecticut Yankee in King Arthur's Court, A 1949 Original Trailer