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Someone -- or something -- is targeting telemarketers for extinction. While some might regard this as a reason for jubilation, Mulder dedicates himself to solving the (apparent) killings. In the course of the investigation, Mulder is kidnapped by a delusional vinyl-siding telemarketer named Gary Lambert (Brian Markinson), who insists that his boss is a monster -- literally. It is up to Scully, who is ostensibly not involved in the case, to come to the rescue. Originally broadcast May 10, 1998, "Folie a Deux" was written by Vince Gilligan.