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