You can buy "A Connecticut Yankee" on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu as download or rent it on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu online.
Making a delivery to a mysterious mansion in a rainstorm, radio salesman Hank Martin is knocked out when a suit of armor topples on him. Upon awakening, Hank finds himself in the time of King Arthur. At Camelot Castle, Hank uses a cigarette lighter and his skill with a lasso to save himself from being executed as a demon. Hank so impresses Arthur that the king orders him to joust with one of his knights to save the life of Princess Alisande.