As its fuel supply dwindles, the fleet must seek out a new supply of tylium ore or risk becoming sitting ducks to any Cylon attack. A recon patrol finds an asteroid full of the fuel, but there’s a catch — the Cylons have found it first and established a heavily guarded refining plant.
Jack and Paul visit the defense contractor who employed Marwan, but the company executives put their own interests ahead of CTU’s and take major steps to destroy evidence.
After a grief-stricken Driscoll relinquishes her command, Heller appoints Tony as interim director to oversee the latest crisis.
With a brief opportunity to send a data transmission to Earth, members of the Atlantis expedition compose video messages home to their loved ones.
The fate of the galaxy hangs in the balance as Sam and Jacob search for the only weapon capable of stopping the Replicator onslaught. O’Neill leads a defense of the S.G.C., while Daniel squares off against Replicator Carter.
President Roslin’s fears that Commander Adama is a Cylon are stoked when she learns he’s making secret wireless calls to other ships. Then, to make things worse, a single Cylon raider appears near the Galactica and begins acting strangely after being damaged in battle.
Jack and Curtis finally learn the location of the override device. They try to trap the architect of the terrorist strike before the remaining nuclear plants go critical.
Tony pushes Dina to reveal more of her knowledge of Marwan, while Driscoll faces another personal crisis with her daughter.
The team searches for a valuable Zero Point Module rumored to be hidden on the planet Dagan — but their new allies have motives of their own.
The Replicators begin a systematic attack of the Goa’uld, forcing Baal to come to Earth for help. The Jaffa Resistance risk their entire movement in an attempt to retake a holy city in Baal’s domain.
A Cylon, who calls himself Leoben, is discovered on one of the ships in the fleet. Commander Adama sends Kara to interrogate him — or, rather, it. The Cylon tells Kara that he planted a nuclear device on one of the ships. Although she doesn’t believe it, Kara passes on the warning.
Audrey places herself in a compromising position when she and Jack learn of her husband’s possible involvement with the terrorists.
Marianne offers Curtis information on the location of the override device in exchange for a lighter sentence, but the tables soon turn and Curtis discovers that there’s another player in the game.
Sarah bargains for a stronger position at CTU, while Tony takes charge of the interrogation of Dina and Behrooz.