Goblin (voice) Karl Johnson as Taliesin Miriam Margolyes as Grunhilda Georgia King as Elena Simon Williams as Lord Godwyn Warwick Davis as Grettir Donald Sumpter as the Fisher King Pauline Collins as Alice Eddie Marsan as the Manticore (voice) Harry Melling as Gilli Ralph Ineson as Jarl Laura Donnelly as Freya Santiago Cabrera as Lancelot Tom Hopper as Percival Episodes References 2010 British television seasons Merlin (2008 TV series)