He was, in truth, a giant insect-like creature who infected his workers one by one, turning them into zombies. His reasons for doing so are never made clear. Gary Lambert, one of his employees, found out the truth and held Pincus and his zombies hostage one afternoon, demanding to be broadcast on TV so he could show the world that a monster walked among them.
Mulder arrived at the building to talk to Pincus, but was held at gunpoint by Gary. With Scully's help, the FBI were able to enter the building and kill Lambert, who did not manage to kill Pincus or show the world his true identity, but Mulder did catch a glimpse of "the monster" within. Mulder gathered evidence by stalking the "zombies", who testified against Mulder, telling Skinner he had a "madman" FBI agent.
Mulder was taken to a psychiatric hospital and strapped to a bed by a zombified nurse, who opened the window after Mulder claimed there was a monster outside the window. Pincus entered, crawled across the ceiling, and was about to infect Mulder when Scully burst in, shot Pincus twice before he smashed through the window and fled. When reporting to Skinner, Scully stated that she remained skeptical of the whole incident, but was adamant there was an intruder in Mulder's room. Pincus remained at large, and began "working" at another telemarketing firm, this time in Missouri.
He was played by John Apicella.