- John Hurt - The Great Dragon (voice)
- Nathaniel Parker - Agravaine de Bois
- Jonny Coyne - Asgerd
- Sophie Rundle - Sefa
- Alexandra Dowling - Kara
- Gary Lewis - Alator
- Sarah Parish - Lady Catrina
- Adam Godley - Jonas
- Charles Dance - Aredian
- Richard Ridings - Halig
- David Schofield - King Alined
- Kevin Eldon - Trickler
- Mark Lewis Jones - King Olaf
- Georgia Tennant - Lady Vivian
- Joseph Mawle - Alvarr
- Emily Beecham - Enmyria
- Erin Richards - Eira
- Asa Butterfield - Mordred
- Julian Rhind-Tutt - Edwin Muirden
- Mackenzie Crook - Cedric
- Liam Cunningham - Ruadan
- Julian Glover - Lochru
- Stephen McCole - Ragnor
- James Fox - King Rodor
- Eve Myles - Mary Collins / Lady Helen
- Will Mellor - Knight Valiant
- Clive Russell - Bayard
- Holliday Grainger - Sophia
- Kenneth Cranham - Aulfric
- Alun Raglan - Cerdan
- Kyle Redmond-Jones - Sir Owain
- Sean Francis - Sir Pellinor
- Alexander Siddig - Kanen
- Joe Dempsie - William
- Frank Finlay - Anhora
- Richard Riddell - Evan
- Jonathan Aris - Matthew
- David Durham - Tom
- Cal MacAninch - Tauren
- Mark Williams - The Goblin (voice)
- Tom Ellis - Cenred
- Louise Dylan - Bronwen
- Andy Linden - Devlin
- Ed Coleman - Morris
- Gary Oliver - Gregory
- Paul Kynman - Sir Cador
- Christopher Fairbank - Black Knight (voice)
- Luke Neal - Sir Geraint
- Jack Sandle - Kelda
- Adrian Lester - Myror
- Alex Price - William
- Mike Goodenough - Fyren
- Jai Armstrong - Guard
- Beth Cordingly - Forridel
- Colin Salmon - Aglain
- Michael Nardone - Kendrick
- James Cosmo - Hengist
- Michael Ballard - Bandit
- Brian Peck - Eldred
- Victoria Finney - Cathryn
- Katie Foster - Beatrice
- Amanda Fairbank-Hynes - Annis
- David Sterne - The Apothecary
- Rhys Rusbatch - Guard
- Jem Wall - Joseph
- Alexander Delamere - Innkeeper
- Matthew Barker - Guard
- Alice Patten - Ygraine
- Simon Nehan - Tom
- Sarah Counsell - Mary
- Andrew Vincent - Dagr
- Shend - Ebor
- Bill Thomas - Cylferth
- Philip Brodie - Sir Ethan
- John Hopkins - Sir Oswald
- Jonathan Emmett - Inn Keeper
- Karl Johnson - Taliesin
- Georgia King - Princess Elena
- Simon Williams - Lord Godwyn
- Miriam Margolyes - Grunhilda
- Michael Jenn - Sidhe Elder
- Jody Halse - Fermin
- Warwick Davis - Grettir
- Ian Peck - Althild
- Donald Sumpter - The Fisher King
- Pauline Collins - Alice
- Eddie Marsan - The Manticore (voice)
- Harry Melling - Gilli
- Duncan Meadows - Orn
- Duncan Meadows - Ewan
- Ian Burfield - Nollar
- Paul McNeilly - Tindr
- Eoin Macken - Gwaine
- Calum MacPherson - Evoric
- Jamie Kenna - Dungeon Guard
- Jamie Kenna - Guard
- Ralph Ineson - Jarl
- Tomiwa Edun - Elyan
- Grahame Fox - Rider
- Laura Donnelly - Freya
- Katie Moore - Drea
- Sarah Beck Mather - The Vilia
- James Greene - Ferryman
- Gemma Jones - The Cailleach
- James Callis - Julius Borden
- Kyle Lima - Caerleon's Guard
- Kyle Lima - Guard
- Steven Hartley - Caerleon
- Lindsay Duncan - Queen Annis
- Trevor Sellers - Iseldir
- Robert Maillet - Derian
- Leander Deeny - George
- Wayne Foskett - John Howden
- Melanie Hill - Mary Howden
- Charlene McKenna - Lamia
- Tom Meredith - Eoghan
- Gareth Jewell - Helios' Servant
- Miranda Raison - Isolde
- Terence Maynard - Helios
- Ben Daniels - Tristan
- Jane Thorne - Valdis
- Gordon Munro - Alrick
- Fintan McKeown - King Odin
- Janet Montgomery - Princess Mithian
- Frances Tomelty - Niede
- Sian Thomas - Atorloppe
- Helen Schlesinger - Befelan
- Andrew Tiernan - Osgar
- Kelly Wenham - Queen Mab
- John Bradley - Tyr Seward
- Veronica Roberts - Gelda Seward
- Tony Guilfoyle - Sindri
- Giles New - Guard
- Alfie Stewart - Daegel
- John Shrapnel - The Sarrum
- Matthew Clancy - Albin
- Mitch Benn - Gerrin
- Maureen Carr - The Dochraid
- Barry Aird - Beroun
- Sorcha Cusack - Finna
- Peter Guinness - Ari
- John Lynch - Balinor
- Michael Cronin - Geoffrey of Monmouth
- Santiago Cabrera - Lancelot
- Phil Davis - The Gleeman
- Jill Trevellick
- Adrian Bell
Alexander Delamere hace el papel de Innkeeper.
James Fox hace el papel de King Rodor.
Charles Dance interpreta a Aredian en la serie.
Eddie Marsan interpreta a The Manticore (voice) en la serie.
Alexander Siddig hace el papel de Kanen.
James Cosmo hace el papel de Hengist.
David Schofield interpreta a King Alined en la serie.
John Shrapnel interpreta a The Sarrum en la serie.
Mackenzie Crook hace el papel de Cedric.
Giles New hace el papel de Guard.
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