Question: Which of the episodes directed by Owen Harris is the fourth episode of the third series of British science fiction anthology series "Black Mirror"?
Context: Black Mirror is a British science fiction television anthology series created by Charlie Brooker.  It centres around dark and satirical themes that examine modern society, particularly with regard to the unanticipated consequences of new technologies.  Episodes are standalone works, usually set in an alternative present or the near future.  The show was first broadcast on the British Channel 4, in December 2011.  A second series ran during February 2013.  Then, in September 2015, Netflix commissioned a third series of 12 episodes, released in 2016.  The commissioned episodes were later divided into two series of six episodes.  The third series was released on Netflix worldwide on 21 October 2016.  Filming for the fourth series concluded in June 2017, with the premiere expected later the same year. He has directed episodes of "Secret Diary of a Call Girl", and "Misfits", and the TV movies "Holy Flying Circus" and "The Gamechangers".  In 2013, he directed "Be Right Back", an episode of the anthology series "Black Mirror", and in 2016 he directed a further episode "San Junipero". "Be Right Back" is the first episode of the second series of British science fiction anthology series "Black Mirror".  It was written by series creator and showrunner Charlie Brooker, directed by Owen Harris and first aired on Channel 4 on 11 February 2013. "San Junipero" is the fourth episode of the third series of British science fiction anthology series "Black Mirror".  Written by series creator and showrunner Charlie Brooker and directed by Owen Harris, it premiered on Netflix on 21 October 2016, together with the rest of series three.  The episode has a substantially happier tone than other "Black Mirror" episodes, and is one of the show's most successful episodes. "Men Against Fire" is the fifth episode of the third series of British science fiction anthology series "Black Mirror".  Written by series creator and showrunner Charlie Brooker and directed by Jakob Verbruggen, it premiered on Netflix on 21 October 2016, together with the rest of series three. "Hated in the Nation" is the sixth and final episode of the third series of British science fiction anthology series "Black Mirror".  Written by series creator and showrunner Charlie Brooker and directed by James Hawes, it premiered on Netflix on 21 October 2016, along with the rest of series three.  It is the longest episode in the series at 89 minutes. "Shut Up and Dance" is the third episode of the third series of British science fiction anthology series "Black Mirror".  It was written by series creator and showrunner Charlie Brooker and William Bridges, and premiered on Netflix on 21 October 2016, together with the rest of series three. "Nosedive" is the first episode of the third series of British science fiction anthology series "Black Mirror".  Michael Schur and Rashida Jones wrote the teleplay for the episode, based on a story by series creator and showrunner Charlie Brooker, while Joe Wright acted as director.  Max Richter composed the soundtrack.  It premiered on Netflix on 21 October 2016, together with the rest of the third series. "White Christmas" is a 2014 Christmas special episode of the British science fiction anthology series "Black Mirror".  It was written by series creator and showrunner Charlie Brooker and directed by Carl Tibbetts, and first aired on Channel 4 on 16 December 2014.  The only television special of the series, it is also the last episode to be aired on Channel 4, as the series would move to Netflix for its third series. "Playtest" is the second episode of the third series of British science fiction anthology series "Black Mirror".  Written by series creator and showrunner Charlie Brooker and directed by Dan Trachtenberg, it premiered on Netflix on 21 October 2016, together with the rest of series three.
Answer: San Junipero