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For the game theory concept, see Zero-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.
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[edit] 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.
