New Adventures of a Yankee in King Arthur's Court (1988)

The plane of the American pilot Hank Morgan got lost in time. The pilot falls into temporary loop and finds himself at the era of the glorious King Arthur. Here he is destined to meet the legendary knights of the Round Table and the insidious Queen Morgana - the sister of the king, the beautiful Sandy and the wise Wizard. He will find himself in the rags of a slave and in knightly armor, to witness the greatness and death of the kingdom.