Series 4 Episode 8 airs at 8.15pm on Saturday 19th November on BBC One and sees a mysterious illness draw Merlin to a distant village. But it soon becomes clear that there is more at stake than just his well-being as something sinister turns the air sour.
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…