The second series of Merlin, is a British fantasy television series which began on 19 September 2009 and ended on 19 December 2009. Series two regular cast members include Colin Morgan, Bradley James, Katie McGrath, Angel Coulby, Anthony Head, Richard Wilson, and John Hurt as the voice of the Great Dragon. Series two contains thirteen episodes and had 5.77 million viewers for the premiere with 6.64 million viewers for the series finale. Series 2 was the first series to have a two-parter and the only series to have a two-parter mid-series. BBC renewed the show for the third series which premiered on 11 September 2010. Plot Merlin continues to serve Prince Arthur while concealing his magical abilities in a kingdom where they are outlawed. New adventures arise in the form of trolls, witchfinders, Druids, the return of an old friend and Dragonlords. While Merlin continues to ensure Arthur grows into the Once and Future King and Arthur and Gwen start to see each other in a new light, a new threat prepares to come to Camelot and a friend will have to make a choice that will alter the legend...forever. Cast Main cast Colin Morgan as Merlin Angel Coulby as Gwen Bradley James as Arthur Katie McGrath as Morgana Anthony Head as Uther Pendragon Richard Wilson as Gaius Recurring John Hurt as the Great Dragon (voice) Emilia Fox as Morgause Rupert Young as Sir Leon Michael Cronin as Geoffrey of Monmouth Asa Butterfield as Mordred (Young) Guest stars Mackenzie Crook as Cedric/Cornelius Sigan Adrian Lester as Myror Alex Price as "Sir William of Deira" Colin Salmon as Aglain James Cosmo as Hengist Santiago Cabrera as Lancelot Sarah Parish as Lady Catrina Adam Godley as Jonas Charles Dance as Aredian, the witchfinder Alice Patten as Ygraine Laura Donnelly as Freya David Schofield as King Alined Georgia Tennant as Lady Vivian Mark Lewis Jones as King Olaf Kevin Eldon as Trickler Joseph Mawle as Alvarr Emily Beecham as Enmyria John Lynch as Balinor Episodes References 2009 British television seasons Merlin (2008 TV series)