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"The Entire History of You" is the third and final episode of the first series of British science fiction anthology series Black Mirror. It was written by the creator of Peep Show and Fresh Meat, Jesse Armstrong, making it the only episode of the series not written or co-written by creator and showrunner Charlie Brooker. It was directed by Brian Welsh, and first aired on Channel 4 on 18 December 2011.
The episode, set in an alternative reality where most people have "grains" recording everything they do, see, or hear, and allowing them to play back their memories in front of their eyes or on a screen, tells the story of Liam (Toby Kebbell), a man who starts suspecting that his wife Ffion (Jodie Whittaker) might have had an affair.
"The Entire History of You" received positive reviews. In 2013, Robert Downey, Jr. optioned the episode to potentially be made into a film by Warner Bros. and his own production company Team Downey.

Source: Wikipedia