The X-Files S05E19
Folie a Deux
Plot: Mulder and Scully are sent to Chicago after after a telemarketing firm receives anonymous threats. The company is particularly concerned as they had an employee go postal in a different office and wants to avoid another dangerous incident. One of the company's employees, Gary Lambert, is convinced that his boss Greg Pincus is literally a monster who no one else can see for what he really is. Lambert takes everyone, including Mulder, hostage but during the incident Mulder realizes that Lambert may not be the deranged madman everyone is making him out to be.
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