who aired the show before that?
Channel 4
Black Mirror
The series premiered for two series on Channel 4 in December 2011 and February 2013. 
what is the meaning of metalhead in black mirror UNANSWERABLE who has written this episode? Charlie Brooker how are the reviews of this episode? It received mostly positive reviews, on Rotten Tomatoes, the episode has a score of 67% based on 24 reviews, with an average rating of 6.87 out of 10. which series does this episode belong to? "Black Mirror" what genre is this series on? British dystopian science fiction anthology television series when did netflix take over this series? September 2015
wiki:11532237
Black Mirror [SEP] Introduction
After its addition to the catalogue in December 2014, Netflix purchased the programme in September 2015. It commissioned a series of 12 episodes later divided into the third and fourth series, each comprising six episodes; the former was released on 21 October 2016 and the latter on 29 December 2017. A standalone interactive film titled "" was released on 28 December 2018. A fifth series, comprising three episodes, was released on 5 June 2019.