It was announced this week that the supernatural drama will end after Series 5, currently airing on Sunday nights at 10pm on BBC Three.
Creator Toby Whithouse has promised an “epic, thrilling and shocking finale that’ll keep the fans guessing and speculating for years to come”.
The 50-second preview includes the first clips of guest stars Julian Barratt (The Mighty Boosh) and Ricky Grover (EastEnders).
Watch the trailer…
> Buy the complete Series 1-4 boxset on Amazon.
What do you think of Series 5 so far? Let us know below…