Question: What one-off special of "Robot Chicken" with twenty episodes aired on Adult swim in 2012?

Context articles: Robot Chicken DC Comics Special
Robot Chicken (season 3)
Robot Chicken: Star Wars Episode II
Robot Chicken (season 5)
Robot Chicken: Star Wars
Robot Chicken (season 6)
Robot Chicken (season 4)
Robot Chicken: Star Wars Episode III
Robot Chicken (season 1)
Robot Chicken (season 2)

Robot Chicken DC Comics Special is an episode of the television comedy series "Robot Chicken" and it was aired as a one-off special during Cartoon Network's Adult Swim on September 9, 2012.
The third season of the stop-motion television series "Robot Chicken" originally aired in the United States on Cartoon Network's late night programming block, Adult Swim.
 Season three officially began on August 12, 2007 on Adult Swim, with "Werewolf vs. Unicorn", and ended with "Chirlaxx" on October 5, 2008, with a total of twenty episodes.
Robot Chicken: Star Wars Episode II is a 2008 episode of the television comedy series "Robot Chicken", and the sequel to the Annie Award winning "", which aired as a one-off special during Cartoon Network's Adult Swim block on November 16, 2008.
 Like "" it has been released on its own DVD, on July 21, 2009, and will not be part of a season box set.
 The DVD contains the original broadcast version, and the "Extended Version", which features an additional 15 minutes of footage cut from the broadcast version.
 It was nominated for a 2009 Primetime Emmy Award for Outstanding Animated Program (for Programming Less Than One Hour).
The fifth season of the stop-motion television series "Robot Chicken" originally aired in the United States on Cartoon Network's late night programming block, Adult Swim.
 Season five officially began on December 12, 2010, on Adult Swim, with "Robot Chicken's DP Christmas Special", and contained a total of twenty episodes.
"Robot Chicken: Star Wars" (also known as "Robot Chicken: Star Wars Episode I") is a 2007 episode of the television comedy series "Robot Chicken", airing as a one-off special during Cartoon Network's Adult Swim block on June 17, 2007.
 It was released on DVD on July 22, 2008.
The sixth season of the stop-motion television series "Robot Chicken" originally aired in the United States on Cartoon Network's late night programming block, Adult Swim.
 Season six officially began on September 9, 2012, on Adult Swim, with "Robot Chicken DC Comics Special" and will contain a total of twenty episodes.
 The first of the regular Season 6 episodes aired on September 16, 2012.
The fourth season of the stop-motion television series "Robot Chicken" originally aired in the United States on Cartoon Network's late night programming block, Adult Swim.
 Season four officially began on December 7, 2008, on Adult Swim, with "Help Me", and ended with "Dear Consumer" on December 6, 2009, with a total of twenty episodes.
Robot Chicken: Star Wars Episode III (also known as Robot Chicken: Star Wars III) is a 2010 episode special of the television comedy series "Robot Chicken", and the third and final installment in the Annie Award-winning and Emmy-nominated "" trilogy.
 It premiered on Cartoon Network's Adult Swim programming block on December 19, 2010.
 The special is 45 minutes long, as opposed to the usual 11-minute "Robot Chicken" runtime and the 21-minute runtime of the two previous Star Wars specials.
 It was the final "Robot Chicken: Star Wars" special.
The first season of the stop-motion television series "Robot Chicken" originally aired in the United States on Cartoon Network's late night programming block, Adult Swim.
 Season one officially began on February 20, 2005 on Adult Swim, with "Junk in the Trunk", and ended with "The Black Cherry" on July 18, 2005, with a total of twenty episodes.
The second season of the stop-motion television series "Robot Chicken" originally aired in the United States on Cartoon Network's late night programming block, Adult Swim.
 Season Two officially began on April 2, 2006 on Adult Swim, with "Suck It", and ended with "Book of Corrine" on November 19, 2006, with a total of twenty episodes.