Series 4 Episode 9 airs at 8.15pm on Saturday 26th November on BBC One and sees Gwen fight temptation before she commits an unspeakable act of betrayal when Sir Lancelot (Santiago Cabrera) returns from the dead.
With heads and hearts thrown into turmoil, Merlin becomes suspicious. Can a man really defy death, or is there something more sinister at play?
Are you looking forward to the episode? Let us know below…
> Order the Complete Series 4 boxset on Amazon.
Watch the Series 4 trailer, with an exclusive introduction by Nathaniel Parker for CultBox…