Guest Stars Lena Headey as Guinevere Sebastian Roché as Gawain Jason Done as Mordred Daniel Brocklebank as Young Merlin Roger Ashton-Griffiths as Sir Boris Jeremy Sheffield as Lancelot John McEnery as Lord Ardente Nicholas Clay as Lord Leo Talula Sheppard as Lady Friend Peter Woodthorpe as Soothsayer Peter Eyre as Chief Physician Vernon Dobtcheff as 1st Physician Nickolas Grace as Sir Egbert Mark Jax as Uther Pendragon Peter Benson as 1st Architect Robert Addie as Sir Gilbert John Tordoff as New Architect Paul Curran as Arthur Billie Whitelaw as Ambrosia Keith Baxter as Sir Hector Thomas Lockyer as Cornwall Peter Bayliss as 2nd Physician Agnieszka Kozon as Young Nimue Alice Hamilton as Young Morgan le Fay Justin Girdler as Young Galahad Rachel Colover as Lady Igraine John Turner as Lord Lot Janine Eser as Lady Elaine Timothy Bateson as Father Abbot Emma Lewis as Elissa
