Black Mirror is only a book.
Black Mirror . The show was first broadcast on the British Channel 4 , in 2011 . In September 2015 , Netflix commissioned a third season of 12 episodes . The commissioned episodes were later divided into two seasons of six episodes ; the third season was released on Netflix worldwide on 21 October 2016 . Regarding the programme 's content and structure , Brooker noted , `` each episode has a different cast , a different setting , even a different reality .