LONDON — Imagine if you could block a person in real life like you might do on Facebook or Twitter.

That's one of the themes being explored in the Christmas special of Black Mirror, starring Mad Men's Jon Hamm, Game of Thrones' Oona Chaplin and The Shadow Line's Rafe Spall.

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The dystopian drama series, which is known for taking a questioning look at the interaction of life and technology, returns to Channel 4 for a 90-minute special, airing in the UK Dec. 16 and in the U.S. on DirecTV's The Audience Network Dec. 25.

Image: Channel 4

Details about the episode are sparse, but the station has described it as "the most mind-bending episode yet."

Consisting of three interwoven stories and set in the near future, the scene is a mysterious and remote snowy outpost where characters Matt (Hamm) and Potter (Spall) share a Christmas meal together and swap tales of their earlier lives in the outside world.

"Matt is a charismatic American trying to bring the reserved, secretive Potter out of his shell. Are both men who they appear to be?"

Image: Channel 4

Meanwhile, Chaplin's character is in a nightmarish world of "smart" gadgetry.

Speaking to Channel 4 ahead of next month's broadcast in an interview released Tuesday, Hamm said it's an excellent way to waste 90 minutes over Christmas and "not talk to your family."

"I think what I can say, for those people that are fans of the show, is that it delivers on the central, dystopian, Twilight-zoney unsettling situation that Black Mirror has delivered in the past," Hamm says.

"There’s always a deeply unsettling aspect to Black Mirror, and we definitely deliver on that."

Hamm said it was his "strange predilection for offbeat British things" that prompted him to ask his agent if he could meet the show's creator, Charlie Brooker.

"I didn’t know he was even working on a third series or a Christmas special or anything, it was simply that I really liked his work and really wanted to meet the guy," he said.

Image: Channel 4

Black Mirror first aired in December 2011 as a three-part series, it returned in February 2013 with another three episodes. Each episode has a different cast.

Plots in previous episodes of the drama have included a Prime Minister having sex with a pig on live television and an alternative reality where most people have a device that allows them to replay their memories.