Question: The finale episode of season 15 of South Park was what numbered episode?

Context paragraphs:
Don't Cry for Me, Albuquerque: "Don't Cry for Me, Albuquerque" is the second-season finale episode of "In Plain Sight" and the 27th episode overall.  Originally designed to be the first of a two-part season finale, the show's creators decided to end the season in cliffhanger fashion.  The companion episode was slated as the third-season premiere and aired on March 31, 2010 ("Father Goes West").

Rehash (South Park): "#REHASH" is the ninth episode in the eighteenth season of the American animated television series "South Park".  The 256th overall episode, it was written and directed by series co-creator and co-star Trey Parker.  The episode premiered on Comedy Central in the United States on December 3, 2014.  The episode is part one of the two-part season finale.  The episode lampoons the popularity of Internet Let's Play celebrities and the phenomena of Internet trending topics that lack actual relevance.  The episode also references and intertwined multiple elements from previous episodes in the eighteenth season of "South Park".  YouTube celebrity PewDiePie plays himself in this episode.

Cartman's Mom Is Still a Dirty Slut: "Cartman's Mom Is Still a Dirty Slut" is the second episode in the second season of the American animated television series "South Park".  The 15th episode of the series overall, it premiered on Comedy Central in the United States on April 22, 1998.  The episode concludes the storyline of the season one finale "Cartman's Mom Is a Dirty Slut"; Mephesto is suddenly shot, just as he is about to reveal the identity of Cartman's father.  The four boys and Chef rush him to Hell's Pass Hospital while the town of South Park experiences a massive blizzard.

South Park (season 15): The fifteenth season of the American animated sitcom "South Park" began airing on Comedy Central on April 27, 2011 and ended on November 16, 2011.  In response to reactions to the mid-season finale episode "You're Getting Old", which seemed to insinuate that creators Trey Parker and Matt Stone were wrapping up the series, Comedy Central proclaimed through the media that "South Park" was renewed for two more seasons, and the duo were signed through 2013.  Shortly before the airing of the season finale episode "The Poor Kid", "South Park" was extended again until 2016, taking the show to 20 seasons.  Parker was the director and writer for all episodes, and Robert Lopez was the writer in this eleventh episode for the fifteenth season.

The Poor Kid: "The Poor Kid" is the fifteenth season finale of the American animated television series "South Park", and the 223rd episode of the series overall.  It first aired on Comedy Central in the United States on November 16, 2011.  In the episode, Kenny and his brother and sister are sent to a foster home after police discover a meth lab in their house.  As a result, Cartman is left with feelings of loss, since he no longer has someone to ridicule for their poverty.

Esperanza (TV series): Esperanza is a Filipino primetime television drama that was aired by ABS-CBN from February 17, 1997 to July 30, 1999 replacing the 4-year run "Mara Clara".  It was re-aired in Studio 23 and Kapamilya Channel, which are both an ABS-CBN subsidiaries.  The show posted the country's highest rating of a single episode in a TV series which is 67%.  Its finale episode rating of 59.8% is the second highest rated finale episode of all time, behind the 2002 finale episode of Pangako Sa 'Yo (also aired by ABS-CBN).  A film adaptation was subsequently made in 1999 by Star Cinema with the same title.

Fatbeard: "Fatbeard" is the seventh episode of the thirteenth season of the American animated television series "South Park".  The 188th overall episode of the series, it originally aired on Comedy Central in the United States on April 22, 2009 and in the United Kingdom on April 24, 2009.  It was the mid-season finale, marking the final "South Park" episode for six months.  In the episode, Cartman misinterprets news reports about piracy in the Indian Ocean to mean the return of the classic era of swashbuckling pirates, and misleads a handful of South Park boys to voyage to Mogadishu to start a pirate crew.

Lost Heroes: "The Batman: Lost Heroes" is the 65th episode and the series finale episode of the series "The Batman".  The episode first aired on Kids WB!  on March 8, 2008 as a one-hour movie.  The episode was part of the Justice League season in which Batman would team up with another hero in the fifth season.

Grey's Anatomy (season 10): The tenth season of the American television medical drama "Grey's Anatomy" premiered on September 26, 2013, with a two-hour special episode in the United States on the American Broadcasting Company (ABC), and it concluded with a "Farewell to Cristina" finale episode "Fear (of the Unknown)" on May 15, 2014.  The season was produced by ABC Studios, in association with ShondaLand Production Company and The Mark Gordon Company; the showrunner being Shonda Rhimes.  The season was officially released on DVD as a six-disc boxset under the title of "Grey's Anatomy: The Complete Tenth Season – Live For The Moments" on September 2, 2014 by Buena Vista Home Entertainment.

List of Miami Vice episodes: The following is an episode list for the 1980s' undercover cop television series "Miami Vice".  In the United States, the show was aired on NBC.  The first episode of the series premiered on September 16, 1984 with the series concluding on May 21, 1989 after five seasons.  Though the series concluded on May 21, 1989, NBC aired three more episodes after the series finale, and USA Network aired a fourth post-series finale episode, thus concluding the series on January 25, 1990.  There are a total of 112 episodes, spanning five years (1984–1989) of the show's run.  The individual seasons are available on DVD in Regions 1, 2 and 4.

Supporting paragraphs: South Park (season 15) The Poor Kid
Answer: 223rd episode