Original Air Date: 07/22/2005
When a scientist is killed in the Daedalus' computer room, McKay (David Hewlett) first believes the poor circuitry is at fault. However, when another scientist is killed while investigating the death, McKay begins to suspect that someone – or something – is deliberately planning these breakdowns.
Soon after, McKay is alerted to a virus on one of the ship's computers. When he runs its code through a translator, he is shocked to discover that it is written in Wraith. Even worse, he learns that the virus has the ability to re-write itself, making it seemingly impossible to conquer. Realizing that the program’s capability to mutate has virtually given it a mind of its own, McKay worries that the Wraith may use the virus to take control of the ship – with potentially deadly results.
As feared, the virus’ artificial intelligence soon takes control of the Daedalus’ auxiliary ships, and the crew becomes increasingly powerless to defend themselves. Fearing that the Wraith will use the Daedalus' advanced features to attack Atlantis, McKay and Sheppard (Joe Flanigan) race against the clock to counteract the virus before the Wraith turn the Daedalus’ advanced technology against the city.
Joe Flanigan as John Sheppard
David Hewlett as Rodney McKay
Rachel Luttrell as Teyla Emmagan
Jason Momoa as Ronon Dex
Paul McGillion as Carson Beckett
Torri Higginson as Elizabeth Weir
| Writer: | Joseph Mallozzi and Paul Mullie |
| Director: | Peter Deluise |
| Studio | MGM |
Stargate Atlantis, Aiden Ford, Elizabeth Weir, Steven Caldwell, Carson Beckett, Teyla Emmagan, Rodney Mckay, John Sheppard, Hank Landry, BTS: The Intruder, EP: The Intruder, The Intruder - promo, Dr. Radek Zelenka, Hermiod,
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