Black Mirror season 4: Watch the chilling trailer for black-and-white episode 'Metalhead'

'Metalhead' is directed by David Slade, best known for his work on Breaking Bad and American Gods

"I can't talk for long," Maxine Peake's character strains into the walkie-talkie, her voice dripping with fear. "We found a dog at the warehouse."

Black Mirror's 'Metalhead', the series' first black-and-white episode, sets up a truly terrifying affair; what are these "dogs"? Exactly how dangerous are they? Who created them?

It's one of several trailers that have slowly made their way to the internet ahead of the upcoming fourth season, set to debut on Netflix, alongside teasers for the Jodie Foster-director 'Arkangel', the memory-tripping 'Crocodile', and the sinister 'Black Museum'.

'Metalhead' is directed by David Slade, best known for his work on Breaking Bad and American Gods, and written by series creator Charlie Brooker.

Speaking to The Independent earlier this year, the show’s producer Annabel Jones offered some insight into the episode.

"This film is in black and white which is a new thing for Black Mirror but it feels the creative decision was earned by the world we’re portraying," she said.

Black Mirror season 4 does not yet have a release date.

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