Episode 22 of "Stargate Atlantis"
s02e02 Intruder
Title: Intruder
Original Air Date: 07/22/2005 on Sci-Fi Channel
Director: Peter DeLuise
Writer: Paul Mullie, Joseph Mallozzi
Guest Stars: Mitch Pileggi (Colonel Steven Caldwell), Garwin Sanford (Simon Wallis), Kimani Ray Smith (Lindstrom), Umar Gordon (Monroe), Heather Doerksen (Bridge Pilot), Beau Bridges (General Hank Landry), Trevor Devall (Hermiod (voice)), Michael Boisvert (Bridge Lieutenant), Gerry Durand (Airman)
Plot Outline:
Earth's battlecruiser Daedalus is infected by a Wraith computer virus. Dr McKay and his team must stop it as members of the Atlantis expedition return from Earth after a meeting at the SGC thanks to the ZPM. During the meeting at the SGC, Dr. Weir learns that the Pentagon plans to replace Major Sheppard with Colonel Caldwell.