Zero Sum The X Files : Season 4 Episode 21
TV-14 FOX 45m int(0)
Aired: April 27th, 1997 @ 8:00 PM EST on FOX
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.