With the Wraith armada bearing down on the city the Atlantis team prepares to evacuate. Setting the city’s self-destruct sequence they hope to make it impossible for the Wraith to gain access to Earth. Things begin to look up when reinforcements from Earth are brought in and it is announced that the battleship Daedalus will arrive in four days. However when the warheads are easily destroyed by the Wraith and the first wave of Wraith attackers strafe the city with weapons fire it becomes increasingly clear that the added reinforcements are not going to be enough. With time running out the Atlantis team must turn to the least likely source of aid – the duplicitous Genii! But with the Wraith overrunning the city even the Genii’s help may not be enough.
When Ezri returns home to investigate O'Brien's disappearance, she uncovers disturbing family secrets.
Trevor has a difficult time adjusting to houseguests; Denise's old friend becomes a new face on the base; Pamela struggles with being away from Chase.
Sydney finds herself face-to-face with her mother. Will's life changes after he finds about SD-6 and Sydney's other life, and Dixon is unsure if he should tell Sloane about Sydney's suspicious behavior.
The Dukes don't realize they've taken on the syndicate, the FBI, Boss Hogg and Sheriff Rosco Coltrane when they try to recover Daisy's money from an unscrupulous music publisher.
