Colin Morgan

Merlin

Angel Coulby

Gwen

Bradley James

Arthur Pendragon

Katie McGrath

Morgana

Anthony Stewart Head

Uther Pendragon

Richard Wilson

Gaius

Michelle Ryan

Nimueh

Alexander Vlahos

Mordred

Rupert Young

Leon · Sir Leon

Tom Hopper

Percival · Sir Percival

Eoin Macken

Gwaine

John Hurt

Kilgharrah (voice)

Santiago Cabrera

Sir Lancelot · Lancelot

Tomiwa Edun

Sir Elyan · Elyan

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

Jonathan Bryan

Sir Radnor

Joseph Mawle

Alvarr

Emily Beecham

Enmyria

Erin Richards

Eira

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

Keith Thorne

Ewan

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

Nicholas Gasson

Steward

Ed Coleman

Morris

Gary Oliver

Gregory

Paul Kynman

Sir Cador

Ben Adams

Bandit

Michael Burgess

Stallholder

Christian Bradley

Guard 2

Christopher Fairbank

Black Knight (voice)

Luke Neal

Sir Geraint

Jack Sandle

Kelda

Adrian Lester

Myror

Alex Price

William

Mike Goodenough

Fyren

James Armstrong

Guard

Beth Cordingly

Forridel

Colin Salmon

Aglain

Justin Avoth

Sir Robert

Michael Nardone

Kendrick

James Cosmo

Hengist

Michael Ballard

Bandit

Brian Peck

Eldred

Victoria Finney

Cathryn

Katie Foster

Beatrice

Amanda Fairbank-Hynes

Annis

Andrew Tiernan

Osgar

Asa Butterfield

Mordred

Barry Aird

Beroun

Ben Daniels

Tristan

Bill Thomas

Cylferth

Donald Sumpter

The Fisher King

Eddie Marsan

The Manticore (voice)

Emilia Fox

Morgause

Gemma Jones

The Cailleach

Giles New

Guard

Grahame Fox

Rider

Harry Melling

Gilli

Ian Burfield

Nollar

Ian Peck

Althild

James Callis

Julius Borden

Jody Halse

Fermin

John Bradley

Tyr Seward

John Hopkins

Sir Oswald

John Lynch

Balinor

John Shrapnel

The Sarrum

Karl Johnson

Taliesin

Lindsay Duncan

Queen Annis

Melanie Hill

Mary Howden

Michael Jenn

Sidhe Elder

Miranda Raison

Isolde

Miriam Margolyes

Grunhilda

Phil Davis

The Gleeman

Ralph Ineson

Jarl

Sian Thomas

Atorloppe

Simon Williams

Lord Godwyn

Sorcha Cusack

Finna

Terence Maynard

Helios

Veronica Roberts

Gelda Seward

Warwick Davis

Grettir

Wayne Foskett

John Howden

Zee Asha

Audrey