The season finale opens with Wraith ships on a mission to kill the team and take the lost city. Is reprogramming Atlantis to self-destruct really the only solution?
O'Brien vanishes on Ezri's home planet, New Sydney, while looking for an operative he befriended; Ezri's family secrets are revealed.
Sydney comes face to face with her mother, who has something sinister in store for her daughter, Sydney hunts for Vaughn, not knowing if he is dead or alive, and Dixon debates informing Sloane of Sydney's suspicious behavior.
Garibaldi's animosity toward Sheridan entices the captain's enemies to approach the former security chief; Franklin and Marcus meet with leaders of the Mars resistance.
The Dukes are pursued by the FBI and the syndicate after a music publisher swindles Daisy and they set out to recover her loss.