"#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.
"#HappyHolograms" is the tenth and final episode in the eighteenth season of the American animated television series "South Park".
 The 257th episode overall, 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 10 2014.
 It is the second part of the two-part season finale which began with the previous episode, "#REHASH".
 The episode makes multiple references to earlier episodes over the season, as well as to previous seasons, while mainly lampooning the trend of culture constantly making trending topics with no actual relevance.
 It also lampoons news events such as the death of Eric Garner, the shooting of Michael Brown, the sexual assault allegations against Bill Cosby, and the use of celebrity holograms.
 YouTube celebrity PewDiePie appeared as himself, continuing his story line from the previous episode.
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" 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.
"Major Boobage" is the third episode in season 12 of the American animated television series "South Park".
 The 170th episode of the series overall, it originally aired on Comedy Central in the United States on March 26, 2008.
 The episode was co-written by series creators Trey Parker and Matt Stone; it was the first South Park episode since 2000 not solely written by Parker, ending a streak of 120 consecutive straight solo episodes.
 The previous episode co-written by Stone was "The Tooth Fairy's Tats 2000".
"Cartman's Mom Is a Dirty Slut" is the first season finale of the American animated television series "South Park".
 It originally aired on Comedy Central in the United States on February 25, 1998.
 The episode is the highest viewed episode in the entire "South Park" series, with 6.4 million views.
 It is part one of a two-episode story arc, which concluded with "Cartman's Mom Is Still a Dirty Slut".
 The episode follows Eric Cartman, one of the show's child protagonists, becoming curious about the identity of his father.
 He discovers that his father is most likely a man his mother had sexual intercourse with during an annual party called "The Drunken Barn Dance".
 Meanwhile, his friends Stan, Kyle and Kenny participate on "America's Stupidest Home Videos", after filming Cartman playing in his yard with plush toys.
"My Finale" is the hour-long season finale for season eight of the American sitcom "Scrubs".
 It was originally broadcast as episodes 18 and 19 of season eight on May 6, 2009, and was intended to be the series finale during production.
 However, the episode was billed as the "Scrubs finale" as at the time of airing it was unknown whether this would be the series finale or the season finale.
 The show ended up returning for a ninth season.
 As the show underwent many changes for the ninth and final season, this is the last episode in which all of the main cast appear as series regulars.
"Cause and Effect" is the 16th episode and the season finale of the sixth season and series finale of the American television series "Numb3rs".
 In the episode, Federal Bureau of Investigation (FBI) agents and mathematicians attempt to find one agent's gun before it is used in a violent crime.
 When series creators/executive producers Cheryl Heuton and Nicolas Falacci learned that the number of episodes airing during the season was reduced, they felt that they needed to finish storylines in case the series was cancelled.
 To do so, they wrote an open-ended story to serve as either a season finale or a series finale.
"The Price of Free and Fair Elections" is the 18th episode and season finale of the third season of the American political thriller television series "Scandal", and is the 47th overall episode.
 It aired on April 17, 2014 on ABC in the United States.
 The episode was written by showrunner Shonda Rhimes and executive producer Mark Wilding and directed by executive producer Tom Verica.
 The season finale was originally supposed to be the 22nd episode, but because of the show's lead Kerry Washington's pregnancy, the episode count was trimmed by ABC by four episodes, leading the season finale to be the 18th episode.
"Basic Sandwich" is the thirteenth episode and the season finale of the fifth season of "Community", and the 97th episode overall in the series.
 It originally aired on April 17, 2014 on NBC.
 The episode was written by Ryan Ridley, making this his series writing debut, and it was directed by Rob Schrab.
 The episode is Part 2 of a two-part season finale; Part 1 ("Basic Story") aired on April 10, 2014 on NBC.
 The episode initially served as the "de facto" series finale, as "Community" was canceled on May 9, 2014, but on June 30, 2014, series creator Dan Harmon announced that the show was renewed by Yahoo! for a 13-episode sixth season to be streamed online on Yahoo! Screen.

Question: Was South Park episode "The Poor Kid," the season premier or season finale?
Answer: season finale