In the wake of the Cylon sneak attack, the ragtag fleet of human survivors is forced to play a deadly game of cat-and-mouse with their pursuers. Every 33 minutes, they make a jump to a new location. And every 33 minutes, the Cylons manage to find them. The pilots are on the brink of exhaustion, relying on artificial stimulants to keep fighting, and the civilians are beginning to doubt the leadership of Commander Adama and President Roslin.

Lt. Sharon Valerii wakes up soaking wet in the tool room with an explosive charge in her duffel bag. Shortly afterward, a mysterious explosion destroys all the port-side water tanks on Galactica, creating a crisis for the entire fleet. Sharon can't remember a thing, but all the evidence points to her as a saboteur. She confesses her concern to Chief Tyrol, but he can't believe she's responsible.

The fleet has found a source of water, but who will take on the difficult and dangerous job of mining it from the icy planet? Commander Adama and President Roslin send Lee to the Astral Queen, a prisoner transport ship, with an offer for its inmates: Volunteer for this mission and earn "freedom points".

After a flight deck accident kills 13 pilots and wounds many others, Kara is thrust into service as a flight instructor and ordered to turn a group of civilian pilots and academy washouts into full-fledged Viper pilots.

When Lt. Kara Thrace goes missing in action after encountering a Cylon patrol while on a training mission, Commander Adama feels responsible — especially in light of her recent admission that she blames herself for his son Zak's death.

When a new copy of Doral, a Cylon who had been previously exposed while serving as the Galactica's public-relations officer, sneaks aboard and blows himself up, killing three people, Commander Adama and President Roslin must finally make public the terrifying secret known only to a select few: Cylons now look like humans.

When Baltar and the Number Six who lives in his head have a falling out, she abandons him, only to surface a short while later aboard the Galactica. But now she's called Shelley Godfrey, everyone can see her, and she's telling them that she has evidence, passed on by the late Dr. Amarak, that will prove Baltar sold out the human race to the Cylons.

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.

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.

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.

When President Roslin calls an Interim Quorum of the Twelve Colonies, she discovers that democracy brings its ugly stepsisters — politics and deadly intrigue — to the party. Tom Zarek, the charismatic convicted terrorist, is elected as the delegate from Sagittaron and immediately proposes elections for the vice-presidency.

While flying a supply patrol, Crashdown and Sharon Valerii discover a bountiful planet that can support human life. Indeed, it might be Kobol, the legendary "home of the gods." The discovery prompts Commander Adama to send a ground team to investigate; it also gives new life to President Roslin's belief that she is a tool of destiny and that this discovery, like her rapidly spreading cancer, is part of an ancient prophecy.

When Commander Adama learns that Kara disobeyed orders and Jumped to Caprica on orders from President Roslin, he demands the president's resignation, with the implied threat of a military coup. Roslin refuses his demand and sparks a confrontation.

With Adama out of action, Colonel Tigh takes his position as commander of the Galactica. Boomer is in jail, and the cat's out of the bag - she's a Cylon.

Tigh has to work with Lee to defeat a Cylon boarding party that threatens to take over Galactica and destroy the fleet.

Democracy is brought back to the fleet and soon with it come hardball politics and potentially deadly intrigue.

Tigh imposes martial law and threatens to split the fleet as Lee works to free President Roslin and organize democratic resistance.

Adama and Roslin fight for the hearts and minds of the fleet's population, as Starbuck finds herself trapped in a supposed resistance hospital.

President Roslin's fragile coalition is put to the test in the first part of a two-part story. Apollo, who has sided with Roslin, runs into a conflict with Zarek and his accomplice Meier.

Adama heads to Kobol to find Roslin, reassembles the fleet and heads down to Kobol himself to find the presidential party in search of the "Tomb of Athena" which allegedly leads to Earth. Apollo hangs out with Starbuck , Zarek tries to keep his cronie off plotting with Boomer who is unaware of tension building between Helo and Tyrol.

A reporter is sent to Galactica to chronicle the harsh realities of life during wartime.

Sharon informs Adama that the Galatica has been infected with a computer virus that is tampering with the basic ship functions and is scanning them for weaknesses. All this is preparation for a major assault by the Cylon Raiders. So with the clock ticking, Commander Adama must pull himself together and decide: Can he trust Sharon?

Battlestar Galactica was not the only Battlestar to have survived the cylon attack, The Battlestar Pegasus also survived.

The Battlestars Galactica and Pegasus face a new Cylon target, a "Resurrection" ship, while a power struggle threatens to result in all-out war among the human fleet.

The struggle between Adama and Cain is temporarily put on hold while the two Battlestars combine forces for an assault on the Cylon Resurrection Ship. Apollo faces a momentous decision and Baltar takes an interest in Gina, the Cylon prisoner.

As President Roslin nears death, Dr. Gaius Baltar must be groomed for the worst case scenario. Roslin orders the death of Sharon's unborn child. A sabotaged Viper leads to an investigation that uncovers a movement of people seeking peace with the Cylons.

Pegasus' new commander Fisk is murdered by black marketeers, and Lee is charged with solving the crime. Roslin seeks to stamp out the black market by introducing new trade regulations.

A crazed Cylon Raider attacks the Colonial fleet in a series of hit-and-run attacks. Overworked Viper pilots must defend a mining operation from this Raider that they nickname "Scar."

A woman takes hostages on Cloud Nine and demands that Adama turn over Sharon in order to avenge her husband's death at the hands of the Cylons.

Apollo assists in the search for a missing Raptor team as the new commander of the Pegasus grows increasingly unstable.

After Boomer's consciousness is downloaded into a new body following her death, she struggles with her new life on Cylon-occupied Caprica. Number Six is asked to help Boomer adjust to her new role in Cylon society.

Chief Tyrol is plagued by terrifying dreams and seeks the aid of a priest. Kara leads a rescue mission to Caprica. Roslin and Baltar go head-to-head in a presidential debate that changes dramatically with the discovery of a habitable planet.

When Baltar wins the vote, Roslin considers stealing the election because she believes he is a Cylon collaborator.