Phillip MacKenzie

Following a vague tip from Deep Throat, Mulder uncovers the secret testing of alien DNA on humans by the government, but he is captured and infected with an alien retrovirus. Deep Throat tries to help the agents and is discovered as Mulder's source and executed.

An armed robber's 35-year-old victim learns his only chance of survival is to have an experimental chip implanted in his brain.

A horror novelist (guest star Linda Blair) is suspiciously close to a number of grisly murders. Fred Williamson also guest stars.