The directors of the series include Alice Troughton, Alex Pillai, Justin Molotnikov and Jeremy Webb.

Nathaniel Parker joined the regular cast in this series (credited as such for the first time in "Aithusa") and John Hurt returned as the voice of the Great Dragon.

Supporting cast members include Adetomiwa Edun, Eoin Macken, Tom Hopper, and Rupert Young.

Notable guest actors include Santiago Cabrera, Emilia Fox, Gemma Jones, Phil Davis, James Callis, Lindsay Duncan, Gary Lewis,[1] Charlene McKenna,[2] Janet Montgomery,[3] Terence Maynard,[3] Ben Daniels,[4] Miranda Raison[4] and Caroline Faber.

The night before the attack, Merlin secretly enters Camelot and places an enchanted stick figure under Morgana's bed that drains her of her powers.

The full list of cast members is as follows:[5][6] The mighty citadel is buzzing in anticipation of the prince's birthday celebrations.

As the dust settles, Camelot is left devastated when Merlin's attempt to save King Uther is foiled by Morgana's magic.

John Hurt who narrated the show and plays the voice of the great dragon, was also upgrade back into a series regular after having a recurring role in season two.