John Hurt

The Dragon

Colin Morgan

Merlin

Bradley James

Arthur

Katie McGrath

Morgana

Angel Coulby

Gwen

Richard Wilson

Gaius

Anthony Head

Uther Pendragon

Rupert Young

Sir Leon

Eoin Macken

Sir Gwaine, Gwaine

Tom Hopper

Sir Percival

Tomiwa Edun

Sir Elyan, Elyan

Nathaniel Parker

Agravaine

Michael Cronin

Geoffrey of Monmouth

Emilia Fox

Morgause

Alexander Vlahos

Mordred

Santiago Cabrera

Lancelot

Michelle Ryan

Nimueh

Caroline Faber

Hunith