Season: 4

Original Airdate: October 5, 2007

Writer(s): Carl Binder

Director(s): Martin Wood

Guest Stars
Torri Higginson as Dr. Elizabeth Weir
Michael Beach as Col. Abe Ellis
David Nykl as Dr. Radek Zelenka
Bill Dow as Dr. Bill Lee
David Ogden Stiers as Oberoth
Sharon Taylor as Replicator

Synopsis: While the team risks going into the Replicators’ city to obtain a ZPM to power the city-ship Atlantis, Col. Samantha Carter joins the crew of the Apollo to search for the missing base.