The X-Files (1993–2018)
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Kill Switch 

The brutal murder of a renowned computer programmer leads Mulder and Scully to investigate an artificial intelligence program loose on the Internet that has begun evolving on its own.


Rob Bowman


Chris Carter (created by), William Gibson | 1 more credit »




Episode complete credited cast:
David Duchovny ... Fox Mulder
Gillian Anderson ... Dana Scully
Kristin Lehman ... Esther Nairn / Invisigoth
Kate Luyben ... Nurse Nancy
Tom Braidwood ... Melvin Frohike
Dean Haglund ... Richard 'Ringo' Langly
Bruce Harwood ... John Fitzgerald Byers
Peter Williams ... Jackson
Rob Daprocida ... Bunny
Patrick Keating ... Donald Gelman
Jerry Schram Jerry Schram ... Boyce
Steve Griffith Steve Griffith ... Paramedic
Ted Cole ... 2nd Paramedic


Mulder and Scully's investigation into a mass shooting in a coffee shop leads them to believe that the targets were not the low level drug dealers and wholesalers who were killed but rather Donald Geldman who had been sitting at a table working on his laptop computer. The Lone Gunmen tell Mulder and Scully that Geldman was one of the original computer geniuses who disappeared years before. His laptop leads the agents to a hacker, Esther Nairn, who goes by the name Invisigoth. She tells them of a vast government conspiracy involving artificial intelligence that allows them to see everything and take action against all enemies. Written by garykmcd

Plot Summary | Add Synopsis


TV-14 | See all certifications »






Release Date:

15 February 1998 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

1.78 : 1
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Did You Know?


Editor Heather MacDougall won an Emmy for her work on this episode. See more »


When Invisigoth takes the phone from Scully and hangs up on Mulder, he is left talking to a dial tone. Since they are using cell phones, there would not be a dial tone after one person hangs up. See more »


Mulder: Call my doctor. You have to call my doctor. Call Doctor Scully.
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References Nurse Nancy (1991) See more »


Twilight Time
Performed by The Platters
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User Reviews

Great X Files written by star cult sci fi novelist William Gibson
7 February 2009 | by joncamaneySee all my reviews

This is actually an amazing episode of The X Files, and quite ahead of its time. Seeing as how the other reviewers find it just an average or slightly above average episode, wanted to take the time to recommend this great story. A fascinating story involving the just emerging cyberworld, this stand alone chapter manages to tie together a gang shoot out in a dilapidated dinner, a sinister digital intelligence inhabiting an unassuming trailer, a cyber punk rebel chic by the name of Invisigoth and dreams of eternal love to become eternal in cyberspace (years ahead of Second Life). That the chapter manages to convey the crazy, infinite, menacing, and liberating aspects of the cyberspace world is quite a triumph, while at the same time including the usually great Mulder and Scully interplay, as well as the indispensable Lone Gunmen. While different in subject than other episodes, this one is quite a threat, courtesy of guest writer William Gibson of "Neuromancer" fame. A great episode of a season full of brilliant episodes.

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