Merlin

Colin Morgan

Merlin

Angel Coulby

Gwen

Bradley James

Arturo Pendragon

Katie McGrath

Morgana

Anthony Stewart Head

Uther Pendragon

Richard Wilson

Gaius

Michelle Ryan

Nimueh

Alexander Vlahos

Mordred

Tom Hopper

Sir Percival, Percival

Rupert Young

Sir Leon, Leon

John Hurt

Kilgharrah (voice)

Tomiwa Edun

Sir Elyan, Elyan

Santiago Cabrera

Sir Lancelot, Lancelot

Eoin Macken

Sir Gwaine, Gwaine

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

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

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

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

Samara MacLaren

Rowena

David Sterne

The Apothecary

Rhys Rusbatch

Guard

Jem Wall

Joseph

Alexander Delamere

Innkeeper

Matthew Barker

Guard

Alice Patten

Ygraine

Jake Phillips

Ghost Boy

Gemma Arrowsmith

Rose

Simon Nehan

Tom

Sarah Counsell

Mary

Andrew Vincent

Dagr

Shend

Ebor

Bill Thomas

Cylferth

Philip Brodie

Sir Ethan

Rick English

Thomas Collins (sin acreditar), The Afanc, Black Knight

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)

Duncan Meadows

Ewan, Orn

Harry Melling

Gilli

Ian Burfield

Nollar

Paul McNeilly

Tindr

Calum MacPherson

Evoric

Jamie Kenna

Guard, Dungeon Guard

Ralph Ineson

Jarl

Raul Griffiths

Druid Boy

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

Steven Hartley

Caerleon

Kyle Lima

Caerleon's Guard, Guard

Lindsay Duncan

Queen Annis

Trevor Sellers

Iseldir

Robert Maillet

Derian

Leander Deeny

George

Wayne Foskett

John Howden

Melanie Hill

Mary Howden

Charlene McKenna

Lamia

Nicholas Croucher

Druid Boy

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

Zee Asha

Audrey

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

Chris McGill

Guard

Caroline Faber

Hunith

Michael Cronin

Geoffrey of Monmouth

Phil Davis

The Gleeman

Asa Butterfield

Mordred