Tonight, Charlie Brooker's acclaimed Black Mirror returns for a Christmas special. The 90-minute episode will feature three interwoven stories dripping in the show's trademark dystopian tech. It stars Jon Hamm (Mad Men), Rafe Spall (Prometheus, The Shadow Line), and Game of Thrones' unlucky bride Oona Chaplin. The exact plot of the show is unknown, but it's set in a world where people have the ability to "block" others, Facebook style, from their entire lives. Black Mirror: White Christmas airs tonight at 9PM on Channel 4 (you'll also be able to catch it later on 4oD) and is described as "the most mind-bending episode" of the show to date.