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Stargate Atlantis episode
“The Intruder”
on board the Daedalus
Original Air Date	July 22, 2005
Season	2
Episode #	1
Production #	2.02
Writer(s)	Joseph Mallozzi Paul Mullie
Director	Peter DeLuise
Guest star(s)	Beau Bridges Garwin Sanford David Nykl Mitch Pileggi Lucia Walters
Episode Order
Previous	Next
"The Siege, Part 3"	"Runner"

The Intruder is the second episode of Stargate Atlantis Season 2. This episode first aired on July 22, 2005.

Plot

As the Daedalus returns from Earth, it becomes apparent that it has been infected by an adaptive Wraith computer virus designed to kill its inhabitants and leave the ship to the Wraith. McKay and Sheppard come up with a plan to save the ship but they must risk their own lives to do so.

Guest Stars

• Beau Bridges as Gen. Hank Landry
• David Nykl as Dr. Radek Zelenka
• Mitch Pileggi as Colonel Steven Caldwell
• Garwin Sanford as Simon Wallis
• Lucia Walters as Ford's Cousin