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