With Princess Mithian as the perfect bait, Morgana conjures a deception so powerful that the whole of Camelot is taken in - even Merlin himself. But as the storm clouds gather, will the young warlock see through the lies? Or will Morgana at long last fulfil her dreams of revenge?

Cast: John Hurt, Fintan McKeown, Katie McGrath, Janet Montgomery, James Fox, Rupert Young, Richard Wilson, Colin Morgan, Bradley James, Angel Coulby, Adetomiwa Edun, Eoin Macken, Tom Hopper