The plot of his illegitimate son Mordred to gain the throne, and Guinevere's growing attachment to Sir Lancelot, threatens to topple King Arthur and destroy his "round table" of knights. Richard Harris, Vanessa Redgrave, Franco Nero, David Hemmings, Lionel Jeffries, Laurence Naismith, Pierre Olaf Added on HBO 2023-02-02. Youtube Trailer