Question: "Kenny Dies" is the 13th episode of an animated series created by what two people?
Context: "Wag the Hog" is the 13th episode of the sixth season of the American animated comedy series "Bob's Burgers" and the 101st episode overall.  It was directed by Brian Loschiavo and written by Holly Schlesinger.  Its guest stars are Robert Ben Garant as Critter, Wendi McLendon-Covey as Mudflap, Sarah Baker as Bethany, Joe Lo Truglio as Carl, Thomas Lennon as Kenny and Melissa Bardin Galsky as Candace.  It aired in the United States on Fox Network on April 10, 2016.  In this episode, Bob Belcher and his children try to get Critter out of prison by selling his motorcycle to the investment banker Kenny while Linda Belcher babysits Critter's and Mudflap's son Sidecar. "The Biggest Douche in the Universe" is the 15th episode of the sixth season and the 94th overall episode of the Comedy Central animated series "South Park".  It was first broadcast on November 27, 2002 and was the last in a mini-arc depicting Cartman being occasionally possessed by Kenny.  The episode is centered on Liane Cartman and Chef attempting to exorcise Kenny's soul while Stan deals with trying to debunk self-proclaimed psychic John Edward, whom the entire crew of South Park Studios agreed to be "the biggest douche in the universe."  The episode is rated TV-MA in the United States, except on syndicated broadcasts, where the episode is rated TV-14, instead. "Death Is a Bitch" is the sixth episode of the second season of the FOX animated series "Family Guy".  It is the 13th episode of "Family Guy" to be aired.  It was produced for season one, but aired in season two.  Due to this fact, Meg is voiced by Lacey Chabert instead of Mila Kunis.  Norm Macdonald guest stars as Death. "Medallion" is the 13th episode of the first season of the CW television series The Secret Circle, and the series' 13th episode overall.  It was aired on February 2, 2012.  The episode was written by Andrew Miller & Andrea Newman and it was directed by Liz Friedlander. "Kenny Dies" is the thirteenth episode of the fifth season of the animated television series "South Park", and the 78th episode of the series overall.  "Kenny Dies" originally aired in the United States on December 5, 2001 on Comedy Central.  In the episode, Cartman comes across a truckload of fetuses he cannot sell thanks to a recent government ruling on stem cell research.  When Kenny is diagnosed with a terminal illness, Cartman uses it to lobby Congress to restore stem cell research. "Simpsorama" is the sixth episode of the twenty-sixth season of the animated television series "The Simpsons", and the 558th episode of the series overall.  It originally aired on the Fox network in the United States on November 9, 2014.  "Simpsorama" is a crossover with "Futurama", another animated series created by "The Simpsons" creator Matt Groening, that had previously aired on Fox and later Comedy Central before concluding in September 2013. South Park is an American adult animated sitcom created by Trey Parker and Matt Stone and developed by Brian Graden for the Comedy Central television network.  The show revolves around four boys—Stan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormick—and their bizarre adventures in and around the titular Colorado town.  Much like "The Simpsons", "South Park" uses a very large ensemble cast of recurring characters and became infamous for its profanity and dark, surreal humor that satirizes a wide range of topics towards a mature audience. The New Batman/Superman Adventures is a name given to a package series that combined "" with "" and "The New Batman Adventures" produced by Warner Bros.  Animation.  It aired from 1997–2000 on Kids' WB.  Each half-hour episode in the hour-and-one-half block featured either a single repeat from the original "Superman: The Animated Series" run, the original "Batman: The Animated Series" run, or a brand new story featuring Batman made specifically for this series, drawn in an animation style to match "Superman: The Animated Series".  These new stories focus more on Batman's supporting cast and introduced new characters such as Tim Drake.  The two animated universes were united in the "Superman" episode "World's Finest", which tells the story of Batman and Superman's first meeting.  The new Batman episodes that began airing in the Fall 1997 season were later released as a DVD box set of "Batman: The Animated Series" as Volume 4.  New Superman episodes that later aired in the Fall 1998 season and onward are now considered to be the third season of "Superman: The Animated Series". Angry Birds Stella is a Finnish computer-animated TV series based on the game "Angry Birds Stella" that was produced by Rovio Entertainment.  The first episode, "A Fork in the Friendship", aired on ToonsTV in November 1, 2014.  The series recounts the tale of Stella, along with her friends Luca, Willow, Poppy and Dahlia, as they work their way against Gale, the former friend of Stella, that is the queen of the pigs in Golden Island.  The first season focuses on Gale trying to hunt for the Golden Egg, but, fails as seen in the final episode of season 1, "To The Bitter End".  The second season focuses on Gale returning and trying to hunt for the Golden Egg again, and she succeeded as seen in "The Golden Queen", the 9th episode of season 2.  Also, Dahlia, one of the birds, tries searching for the egg as well for an experiment, but this time, she fails, as seen in "It's Mine!" , the 6th episode of season 2.  Soon enough, the birds realize how dangerous this egg can be, as seen in "Premonition", the 11th episode in season 2, which in when Gale with the Golden Egg, anything that is touched with it, turns to gold.  However, when that happens, another thing turns to stone, the opposite of gold, which causes nature, and even worse, food to be turned to stone as well.  Now, it is up to the Stella gang to save Golden Island before it is too late.  They do succeed, as seen in "You Asked For It", the 13th and final episode of season 2 and the series finale of "Angry Birds Stella", where after a long awful night, Stella and her gang launch the Golden Egg out of the island, never to be seen again.  Gale does not mind because when she saw the Golden Egg after she broke out of the gold in the episode, she ran away, back into her castle. "Your Fault" is the 13th episode of the ABC television series, "Desperate Housewives".  The episode was the 13th episode for the show's first season.  The episode was written by Kevin Etten and was directed by Arlene Sanford.  It originally aired on Sunday January 23, 2005.
Answer: Trey Parker and Matt Stone