Merlín

Colin Morgan

Merlin

Angel Coulby

Gwen

Bradley James

Arthur

Katie McGrath

Morgana

Richard Wilson

Gaius

John Hurt

The Great Dragon (voice)

Anthony Stewart Head

Uther Pendragon

Nathaniel Parker

Agravaine de Bois

Rupert Young

Leon / Sir Leon

Eoin Macken

Gwaine / Sir Gwaine

Tom Hopper

Sir Percival

Tomiwa Edun

Elyan / Sir Elyan

Michael Cronin

Geoffrey of Monmouth

Emilia Fox

Morgause

Alexander Vlahos

Mordred

Santiago Cabrera

Lancelot / Sir Lancelot

Michelle Ryan

Nimueh

Tom Ellis

Cenred

Caroline Faber

Hunith

Asa Butterfield

Mordred

Rhys Rusbatch

Guard

Alice Patten

Ygraine

Trevor Sellers

Iseldir

Terence Maynard

Helios

Zee Asha

Audrey

Sophie Rundle

Sefa

Gary Lewis

Alator

Sarah Parish

Lady Catrina

Adam Godley

Jonas

Erin Richards

Eira

Liam Cunningham

Ruadan

Stephen McCole

Ragnor

David Durham

Tom

Ed Coleman

Morris

Rick English

Black Knight / The Afanc

Gary Oliver

Gregory

Jamie Kenna

Dungeon Guard / Guard

Duncan Meadows

Ewan / Orn

Jake Phillips

Ghost Boy

Simon Nehan

Tom

Michael Jenn

Sidhe Elder

Calum MacPherson

Evoric

Laura Donnelly

Freya

James Greene

Ferryman

Gemma Jones

The Cailleach

Kyle Lima

Caerleon's Guard / Guard

Lindsay Duncan

Queen Annis

Miranda Raison

Isolde

Ben Daniels

Tristan

Fintan McKeown

King Odin

Janet Montgomery

Princess Mithian

John Bradley

Tyr Seward

Maureen Carr

The Dochraid

John Lynch

Balinor

Philip Brodie

Sir Ethan

Jonny Coyne

Asgerd

Alexandra Dowling

Kara

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

Julian Rhind-Tutt

Edwin Muirden

Mackenzie Crook

Cedric

Julian Glover

Lochru

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

Cal MacAninch

Tauren

Mark Williams

The Goblin (voice)

Louise Dylan

Bronwen

Andy Linden

Devlin

Nicholas Gasson

Steward

Paul Kynman

Sir Cador

Ben Adams

Bandit

Michael Burgess

Stallholder

Christian Bradley

Guard

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

Jem Wall

Joseph

Alexander Delamere

Innkeeper

Matthew Barker

Guard

Gemma Arrowsmith

Rose

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

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

Ian Burfield

Nollar

Paul McNeilly

Tindr

Ralph Ineson

Jarl

Raul Griffiths

Druid Boy

Grahame Fox

Rider

Matthew Crawford

Bandit

Katie Moore

Drea

Sarah Beck Mather

The Vilia

Phil Holden

Geldred

James Callis

Julius Borden

Steven Hartley

Caerleon

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

Jane Thorne

Valdis

Gordon Munro

Alrick

Frances Tomelty

Niede

Sian Thomas

Atorloppe

Helen Schlesinger

Befelan

Andrew Tiernan

Osgar

Kelly Wenham

Queen Mab

Veronica Roberts

Gelda Seward

Tony Guilfoyle

Sindri

Giles New

Guard

Alfie Stewart

Daegel

John Shrapnel

The Sarrum

Matthew Clancy

Albin

Mitch Benn

Gerrin

Barry Aird

Beroun

Sorcha Cusack

Finna

Peter Guinness

Ari

Chris McGill

Guard

Phil Davis

The Gleeman