Merlin sets off on a journey to find a sword suitable for a king by seeking out a legendary sword maker. A conversation with Guinevere changes Arthur and he begins to assert his power by sparring with Leontes.

Cast: Joseph Fiennes, Jamie Campbell Bower, Tamsin Egerton, Claire Forlani, Peter Mooney, Philip Winchester, Eva Green, Lara Jean Chorostecki, Chipo Chung, Lauren Coe, Sinéad Cusack, Jamie Downey, Diarmaid Murtagh, Daragh O\'Malley, Vincent Regan