The team finds a world whose people are on the brink of a discovery that may make them immune to the Wraith feeding.

Efforts to open trade relations with a species called the Genii turn sour when the team discovers their new "allies" have ulterior motives.

Colonel Sheppard begins to undergo a disturbing physical transformation after being exposed to Beckett's anti-Wraith drug.

The team is captured by the missing Lieutenant Ford, who is now leading a group of young men who are taking the Wraith enzyme -- and who wants the team's help in a suicide attack against a hive ship.

The Atlantis expedition is stunned to learn that a ship full of Ancients is returning to reclaim their lost city.

The Atlantis team goes against orders to try and save Atlantis from Replicator control -- and to rescue General O'Neill and Richard Woolsey, who are trapped in the occupied city.