The X-Files Season 4 Episode 21 Zero Sum ( Air Date 1997-04-27 ) Genre Mystery, Sci-Fi & Fantasy, Crime category. Overview "After a swarm of bees mysteriously kill a postal worker in an enclosed restroom, Assistant Director Skinner covers it up by destroying the evidence. In order to complete the task he poses as Agent Mulder, however his deception backfires. When Mulder finds out and confronts him, Skinner reveals that he is working for the Cigarette-Smoking Man in order to obtain a possible cure for Scully's cancer.".
The X-Files Season 4 Episode 21 Zero Sum
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- Watch: The X-Files Season 4 Episode 21 Zero Sum on CWR-CRB
- Stars: David Duchovny, Gillian Anderson, Mitch Pileggi
- Director: Gabe Rotter, Mark Snow, Chris Carter, Glen Morgan, Rick Millikan
