Jack forces Nina to work with him in order to get the virus from Amador.
Palmer meets with Sherry and convinces her to help him deal with Milliken.
Chase remains in Mexico to help with the capture of the virus.
Ramon and Hector quarrel when Hector wants to pull out of the deal.
When the Kelownans discover that a massive underground vein of naquadah is being converted into naquadria, Jonas Quinn seeks help from Earth in avoiding the total destruction of his planet.
Carter is injured when the Prometheus is attacked by an unknown ship, and awakens to find herself stranded alone in deep space.
Claudia manages to free Chase from his captors, but she pays a high price for her efforts.
Wayne turns to Julia, while Palmer calls on Sherry for help against Milliken.
Jack and Ramon make plans to get to Nina, in the hopes of intercepting the virus.
Chloe’s work at CTU is disrupted when she is forced to take care of her baby.
O’Neill seeks help from a former comrade to rescue Daniel and Dr. Lee, who have been kidnapped in Central America. Carter, Teal’c and Jacob infiltrate Anubis’ super-soldier facility.
Palmer clears Anne’s name with the press, but he finds that he is facing a new problem when his biggest campaign contributer reveals a startling secret about Wayne.
Kim and Michelle worry about Tony’s mental ability when he continues to make mistakes.
Jack and the Salazars meet with Amador, but the deal turns sour when Nina Myers appears on the scene and competes for the virus.
Palmer and Chappelle view a message from Jack, explaining his undercover work with the Salazars. Meanwhile, Hector tries to convince Ramon that they should deal with Bauer so that they can get their hands on the virus.
Jack has a private moment with Claudia and she blasts him for leaving her behind when he arrested Ramon.
Chase arrives in Mexico, but is captured by Hector’s men. Ramon devises a way for Jack to prove his loyalty to them.
Anne manages to clear Palmer’s name, but she breaks off her relationship with him.
Fleeing from the Cylon tyranny, the last Battlestar, Galactica, leads a rag-tag fugitive fleet, on a lonely quest…a shining planet, known as…Earth.
Ramon holds Jack hostage as he flies to Mexico. Ramon plans to kill Jack, but Jack manages to hold him at bay until the plane lands. Ramon then learns that Jack and Hector are working together to break him out of prison.
Gael is captured while trying to escape from CTU. Chappelle interrogates Gael but is interrupted by Tony, who claims that Gael is part of a bigger plan.
Anne is given a chance to clear Palmer’s name, while Chase heads for Mexico to rescue Jack.
Forty years after the end of the Cylon War, the artificially-created Cylons declare war on humanity by attacking and destroying the twelve colonies. The military crumbles after their newly updated ships shut down in the face of a new unknown Cylon weapon. A lone Battlestar, Galactica, due to be decomissioned and converted into a museum, turns out to be the only thing standing between the Cylons and the total destruction of the human race.