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Series 4

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The fourth series of the British drama series Merlin began on 1 October 2011 with the episode The Darkest Hour - Part One and next The Darkest Hour - Part Two. It consists of 13 episodes originally shown on Saturday evenings on BBC One and BBC One HD (repeats shown on BBC Three). Series producer is Sara Hamill and executive producers are Johnny Capps and Julian Murphy. Directors include Alice Troughton, Alex Pillai, Justin Molotnikov and Jeremy Webb. Writers include Julian Jones (head writer), Howard Overman, Jake Michie, Lucy Watkins, and Richard McBrien.

Episodes
The Darkest Hour: Part One The Darkest Hour: Part Two The Wicked Day Aithusa His Father's Son A Servant of Two Masters The Secret Sharer Lamia Lancelot Du Lac A Herald of the New Age The Hunter's Heart The Sword in the Stone: Part One The Sword in the Stone: Part Two Add a photo to this galleryAdd a photo to this gallery

Main cast
Colin Morgan as Merlin Bradley James as Arthur Richard Wilson as Gaius Angel Coulby as Gwen Katie McGrath as Morgana Anthony Head as Uther Nathaniel Parker as Agravaine Eoin Macken as Gwaine Tom Hopper as Percival Rupert Young as Leon Adetomiwa Edun as Elyan Santiago Cabrera as Lancelot Add a photo to this galleryAdd a photo to this gallery

Recurring cast
Emilia Fox as Morgause Zee Asha as Audrey Michael Cronin as Geoffrey Trevor Sellers as Iseldir Terence Maynard as Helios Caroline Faber as Hunith Add a photo to this galleryAdd a photo to this gallery

Guest stars
James Greene as Ferryman Gemma Jones as The Cailleach Katie Moore as Drea Sarah Beck Mather as Vilia Phil Davis as The Gleeman James Callis as Julius Borden Steven Hartley as King Caerleon Lindsay Duncan as Annis Robert Maillet as Derian Leander Deeny as George Gary Lewis as Alator of the Catha Charlene McKenna as Lamia Melanie Hill as Mary Howden John Howden as Wayne Foskett Maureen Carr as Dochraid Nicholas Croucher as Shrine Boy Janet Montgomery as Mithian Tom Meredith as Eoghan Miranda Raison as Isolde Ben Daniels as Tristan Add a photo to this galleryAdd a photo to this gallery

Enemies and creatures
Agravaine Queen Annis in His Father's Son Alator in The Secret Sharer Caerleon in His Father's Son Derian in His Father's Son Dochraid in Lancelot du Lac Dorocha in The Darkest Hour Vilia in The Darkest Hour Aithusa in Aithusa (episode), The Sword in the Stone Fomorroh in A Servant of Two Masters Geldred in The Wicked Day Helios in The Hunter's Heart, The Sword in the Stone Julius Borden in Aithusa (episode) Lamia in Lamia (episode) Lancelot's Shade in Lancelot du Lac Merlin(possessed) in A Servant of Two Masters Morgana Morgause in The Darkest Hour, The Secret Sharer (deleted scene) Nathair in The Sword in the Stone Orn in The Secret Sharer Southrons from Lamia (episode),The Hunter's Heart, The Sword in the Stone The Gleeman from The Wicked Day The Cailleach from The Darkest Hour Wilddeoren in The Darkest Hour Wyvern in The Darkest Hour Add a photo to this galleryAdd a photo to this gallery

Series 4
The Darkest Hour • The Wicked Day • Aithusa • His Father's Son • A Servant of Two Masters • The Secret Sharer • Lamia • Lancelot du Lac • A Herald of the New Age • The Hunter's Heart • The Sword in the Stone

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