Merlin

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

Sir Leon

Tom Hopper

Percival

John Hurt

Kilgharrah (voice)

Eoin Macken

Sir Gwaine

Tomiwa Edun

Sir Elyan

Santiago Cabrera

Lancelot

Nathaniel Parker

Agravaine de Bois

Jonny Coyne

Asgerd

Sophie Rundle

Sefa

Alexandra Dowling

Kara