Dr. Brendan Gall, one of the scientists on Atlantis, discovers a Lagrangian point satellite and Sheppard, McKay, Gall and another scientist, Dr. Abrams are sent to investigate. It was used by the Ancients as a last line of defense before Atlantis during the war with the Wraith 10.000 years ago, but it seems to be out of commission. Not long after the team picks up a distress call from a planet nearby. It's coming from a Wraith ship that crashed during the war and the team takes a look. McKay is absolutely convinced no living thing could survive that long, but the team discovers signs of Wraith cannibalism and a storage compartment for humans. McKay begins to doubt his assumption.