Given the question: Build a movie plot around this: Who is Arthur's illegitimate son from ? Queen Morgause
The answer is:
During the opening credits, like the Broadway production, the studio orchestra plays a potpourri overture that features the "Camelot March" and the title song. The action begins in early morning darkness as a chorus sings a few lines from "Guenevere." Arthur (Richard Harris) talks to his unseen teacher, Merlyn (Laurence Naismith), asking him why everything that has happened to them happened. Before a battle begins at dawn with Lancelot (Franco Nero) and his Joyous Gard knights, Arthur, talking as much to himself as to Merlyn, tries to determine where he went wrong. Merlyn appears and urges the mighty King to think back to one of the most important days of his life. Almost all of the rest of the film is a flashback. It first flashes back to Arthur as a youngster (Nicholas Beauvy); he is walking in the woods in the early morning when he encounters Merlyn, who calls Arthur "Wart." Then suddenly, Merlyn interrupts to chide Arthur for going too far back in his memory. The important day Arthur is supposed to remember, Merlyn says, is the day he met Guenevere (Vanessa Redgrave).The following scene shows Arthur in a large snow-laden tree watching people pass on the road beneath. From his perch, Arthur sings "I Wonder What the King Is Doing Tonight?" He imagines that his subjects are pondering what he is doing in the final hours before his arranged marriage. Arthur admits that even though he has faced battle bravely, he's terrified of facing his bride-to-be. As the song ends, a procession approaches ("Camelot March") carrying Guenevere. She is not at all thrilled that her wedding is an inconvenient marriage of convenience. In despair, Guenevere sings "The Simple Joys of Maidenhood." The lyrics question how she missed the normal life of a maiden and all its simple pleasures like knights tilting for her and "kith not kill their kin" for her. The procession halts for a rest so the royal hairdresser can prepare Guenevere to meet her mate. While everyone is busy, Guenevere sneaks away into the woods. She kneels in the snow...