artistic contribution is discussed by Futurama co-creator Matt Groening, who describes Cohen as being very particular about how the animators used his design, and that Cohen's original drawing is still framed in his office. He makes some brief cameo appearances in cartoon form, first in the Futurama episode "A Bicyclops Built for Two", along with several other people who worked on the show, and second on "I Dated a Robot" as a member of the eBay audience. Both appearances are pointed out during DVD commentaries. Name change When the FOX primetime animated shows unionized in 1998, Cohen was forced to use a different name for professional purposes, as there was already another member credited as David S. Cohen (who worked on Courage the Cowardly Dog). The Writers Guild of America does not allow multiple members to use the same name for onscreen credits. Instead of using his full middle name, he chose to use the middle initial "X"—because it sounded "sci-fi-ish"—and has jokingly said that the "X" would make him "the David Cohen people would remember". The "X" does not actually stand for anything, but Cohen included a period "so people don't think it's some mathematical formula: 'David times Cohen' or something". Writing credits Cohen is credited with writing or co-writing the following episodes: Disenchantment "For Whom the Pig Oinks" (2018) "Stairway To Hell" (2019) Futurama "Space Pilot 3000" (with Matt Groening) (1999) "Xmas Story" (1999) "Anthology of Interest I" (Part 3) (2000) "The Day the Earth Stood Stupid" (shared story credits with Jeff Westbrook) (2001) "Anthology of Interest II" (Part 2) (2002) "The Why of Fry" (2003) Bender's Big Score (story with Ken Keeler) (2008) The Beast with a Billion Backs (story with Eric Kaplan) (2008) Bender's Game (both story and part 4 of the teleplay) (2009) Into the Wild Green Yonder (story with Ken Keeler; Parts 1 & 4) (2009) "Rebirth" (2010) "Free Will Hunting" (2012) The Simpsons "Treehouse of Horror V" ("Nightmare Cafeteria") (1994) "Lisa the Vegetarian" (1995) "Treehouse of Horror VI" ("Homer3") (1995) "22 Short Films About Springfield" (co-contributor) (1996) "Much Apu About Nothing" (1996) "Treehouse of Horror VII" ("Citizen Kang") (1996) "The Itchy & Scratchy & Poochie Show" (1997) "The Simpsons Spin-Off Showcase" ("Chief Wiggum, P.I.") (1997) "Treehouse of Horror VIII" ("Fly vs. Fly") (1997) "Lisa the Skeptic" (1997) "Das Bus" (1998) "Bart the Mother" (1998) "Treehouse of Horror IX" ("Starship Poopers") (1998) "Podcast News"