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