Home / Series / The X-Files / Official Order / Season 4 / Episode 21
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Zero-Sum

Skinner destroys evidence to cover up a woman's death and poses as Agent Mulder to complete the task. Mulder finds out about Skinner's deception and confronts him, and Skinner reveals that he is working for the Cigarette-Smoking Man in order to obtain a possible cure for Scully's cancer.

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  • Originally Aired April 27, 1997
  • Runtime 45 minutes
  • Production Code 4X21
  • Original Network FOX
  • On Other Sites IMDB
  • Parental Guideline TV-14
Name Type
Kim Manners Director
Frank Spotnitz Writer
Howard Gordon Writer
Addison Ridge Guest Star
Allan Gray Guest Star
Barry Greene Guest Star
Christopher J. Newton Guest Star
Fred Keating Guest Star
Lisa Stewart Guest Star
Nicolle Nattrass Guest Star
Paul McLean Guest Star
Sterling McKay Guest Star

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  • This episode is considered complete!