Reparto

• Colin Morgan — Merlin
• Bradley James — Arthur Pendragon
• Angel Coulby — Guinevere Pendragon
• Katie McGrath — Morgana Pendragon
• Anthony Head — Uther Pendragon
• Richard Wilson — Gaius
• John Hurt — Kilgharrah
• Michael Cronin — Geoffrey of Monmouth
• Michelle Ryan — Nimueh
• Santiago Cabrera — Lancelot
• Asa Butterfield — Mordred
• Rupert Young — Sir Leon
• Eoin Macken — Sir Gwaine
• Emilia Fox — Morgause
• Alexander Vlahos — Sir Mordred
• Nathaniel Parker — Agravaine de Bois
• Tomiwa Edun — Sir Eylan
• Tom Hopper — Sir Percival