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What "The X-Files" 21-th episode about
Skinner destroys evidence to cover up a woman's passing 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.
Episode number: 21
Episode name: "Zero-Sum"
Episode release date: 28 april 1997 at 01:00
Status: aired
Rating: 8.1