Gawain and the Green Knight
Gawain and the Green Knight is a 1973 film directed by Stephen Weeks, and starring Murray Head as Gawain and Nigel Green in his final theatrical film as the Green Knight. The story is based on the medieval English tale Sir Gawain and the Green Knight and also Yvain, the Knight of the Lion by Chrétien de Troyes and the tale of Sir Gareth in Thomas Malory's Le Morte d'Arthur.
The mysterious Green Knight appears before King Arthur's court in the New Year and demands the head of Sir Gawain as the prize in a bizarre game. Given a year's grace, Gawain sets off in search of the Knight for a rematch.