- Zero Sum
Infobox Television episode | Title = Zero Sum
Caption =
Series =The X-Files
Season = 4
Episode = 21
Airdate =April 27 ,1997 (Fox)
Production = 4x21
Guests = ?
Writer =Howard Gordon &Frank Spotnitz
Director =Kim Manners
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Prev =Small Potatoes
Next = Elegy"For thegame theory concept, seeZero-sum .""Zero Sum" is the twenty-first episode of the fourth season of television series "
The X-Files ". Agent Mulder launches a criminal investigation into a bizarre death which he finds has connections to A.D. Skinner. Meanwhile, Skinner makes his own deal with the devil in a desperate attempt to save Scully from the cancer that is taking over her body.External links
*imdb title|0751266|Zero Sum
* [http://www.tv.com/the-x-files/zero-sum/episode/584/summary.html?tag=ep_list;title;20 Zero Sum] atTV.com Trivia
*This is one of the four episodes in "The X-Files" run to not feature Dana Scully, the others being "3", "
Unusual Suspects " and "Travelers."
*At 23:31 into the episode,Walter Skinner is flipping through files in Mulder's office. Only one file has a visible name tag. If you look closely it says the name Foo Fighters. It is in reference to actual foo fighters, not the band.
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