Episode Overview
The Atlantis base is threatened when the team discovers that an alien entity is in the city. McKay's experiment with alien technology goes awry.
Guest Stars
Paul McGillion
Carson Beckett
Boyan Vukelic
Sgt. Stackhouse
Reece Thompson
Jinto
Casey Dubois
Wex
Meghan Black
Marta
Jon Johnson
Parker
Craig Veroni
Dr. Peter Grodin
Christopher Heyerdahl
Halling
Chris Bradford
Marine (uncredited)
Tony Baretta
Smitty (Uncredited)
Colin Decker
Marine (uncredited)