Colin Morgan returns as our secret hero Merlin, who must fulfil his destiny to protect the young Prince Arthur (Bradley James) and the kingdom of Camelot, a place where magic has been banned by the ruthless King Uther (Anthony Head).

They join Katie McGrath as the mesmerising Morgana, the King's ward who has a secret she dare not reveal; Angel Coulby as her loyal maid Gwen, who begins her difficult journey towards becoming the Queen Guinevere of legend; and Richard Wilson as wise Court Physician Gaius.

The inimitable John Hurt returns as the voice of the Great Dragon, the mythical creature imprisoned by the King.

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