The soundtrack interweaves 1980s songs with an original score by Clint Mansell. Filming took place in London and Cape Town across several weeks. The first script was about a heterosexual couple and had an unhappy ending, and the final version was about a lesbian couple and had a happy ending. "San Junipero" was the first episode written for series three of Black Mirror initial drafts were based on nostalgia therapy and designed as a 1980s period piece. The town is part of a simulated reality the elderly can inhabit, even after death. The episode is set in a beach resort town named San Junipero, where the introverted Yorkie ( Mackenzie Davis) meets the more outgoing Kelly ( Gugu Mbatha-Raw). Written by series creator and showrunner Charlie Brooker and directed by Owen Harris, it premiered on Netflix on 21 October 2016, with the rest of series three. " San Junipero" is the fourth episode in the third series of the British science fiction anthology television series Black Mirror.