A Servant of Two Masters airs at 8.15pm on Saturday 5th November on BBC One and sees Merlin become a deadly weapon in Morgana’s fight for supremacy. Using ancient magic, she pits friend against friend and creates the perfect assassin.

Are you looking forward to the episode? Let us know below…

> Order the Series 4 Volume 1 DVD on Amazon.

Watch the Series 4 trailer, with an exclusive introduction by Nathaniel Parker for CultBox…