Guest Stars James Purefoy as King Lot Sean Pertwee as Ector Sebastian Koch as King Uther Lucy Cohu as Arthur's Foster Mother Co Starring Diarmaid Murtagh as Brastias Jamie Downey as Ulfius George McMahon as Messenger Caoimhe O'Malley as Scullery Girl Adam Goodwin as Pellinor Brian McGuinness as Nentes Colin J. Maher as Duke of Cornwall Fergus Kealy as Scotland John Benfield as Alded Hope Brown as Old Duke of Cornwall David Coakley as Lot's Outrider Mieke Dockley as Anna Joe Doyle as Uriens Ian Bartholomew as Catrain