The X-Files Season 4 Episode 21
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.
4 - 24GethsemaneMay. 18, 1997- 4 - 23DemonsMay. 11, 1997
- 4 - 22ElegyMay. 04, 1997
- 4 - 21Zero SumApr. 27, 1997
- 4 - 20Small PotatoesApr. 20, 1997
- 4 - 19SynchronyApr. 06, 1997
- 4 - 18MaxMar. 23, 1997
- 4 - 17Tempus FugitMar. 16, 1997
- 4 - 16UnrequitedFeb. 23, 1997
- 4 - 15KaddishFeb. 16, 1997
- 4 - 14Memento MoriFeb. 09, 1997
- 4 - 13Never AgainFeb. 02, 1997
- 4 - 12Leonard BettsJan. 26, 1997
- 4 - 11El Mundo GiraJan. 12, 1997
- 4 - 10Paper HeartsDec. 15, 1996
- 4 - 9TermaDec. 01, 1996
- 4 - 8TunguskaNov. 24, 1996
- 4 - 7Musings of a Cigarette Smoking ManNov. 17, 1996
- 4 - 6SanguinariumNov. 10, 1996
- 4 - 5The Field Where I DiedNov. 03, 1996
- 4 - 4UnruheOct. 27, 1996
- 4 - 3TelikoOct. 18, 1996
- 4 - 2HomeOct. 11, 1996
- 4 - 1HerrenvolkOct. 04, 1996
