The mood aboard the Galactica turns jubilant when the top-of-the-line battlestar Pegasus - long thought to have been annihilated with the rest of the colonial fleet - appears out of nowhere.
Kara "Starbuck" Thrace prevents a potentially deadly face-off between the battlestars Galactica and Pegasus when she returns at the last second from her unauthorised mission in the blackbird stealth fighter.
President Laura Roslin lies near death in the Galactica's sickbay. Still lucid and in command, she orders that the pregnancy of the Cylon spy Sharon be terminated, after inexplicable properties are discovered in a fetal blood sample.
Baltar is accused of treason, by none other than Number Six (posing as someone else). As the Galactica crew investigates the matter, Baltar is left to ponder his fate - and his own place in the world.
A suicide bomber detonates himself aboard Galactica but when the insurgent is revealed to be a human-like Cylon, rumour of such a thing becomes hard reality.
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.
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.
Continues on from the events of Battlestar Galactica: The Miniseries. 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.
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.
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.
With Commander Adama fighting for his life and President Roslin languishing in the Galactica's brig, Col. Tigh is thrust into the unfamiliar role of sole leader in a time of crisis.
The Galactica has succeeded in reuniting with the fleet, but it has paid a terrible price: a Cylon computer virus has penetrated its computers, robbing the ship of power, and Cylon Centurions have boarded the Galactica.
Now that the fleet is reunited, old conflicts reignite. Criticism of the military reaches a fever pitch in the aftermath of the massacre on the Gideon.
After sending one more dilapidated Viper to the scrap heap, Tyrol vents his frustration by attempting to build a new plane from salvaged parts. Meanwhile, a Cylon virus penetrates the Galactica's computers.
Commander Adama returns to a hero's welcome and an unenviable task: in order to maintain control of the fleet, he must track down his son, Lee, and President Roslin, who have escaped.
With more than a third of the fleet split from Galactica, Adama admits that there is no substitute for the people he has lost, and resolves to find them.
With the Galactica outgunned by four Cylon base ships, and the Colonial forces on the ground being flanked by a platoon of Cylon Centurions, how far will Admiral Adama go to keep the Cylons from capturing the artifact that shows the way to Earth?
Imprisoned and facing charges of treason, former Colonial president Gaius Baltar survives a suicide attempt - only to face extreme interrogation techniques by his captors aboard the Galactica.
After the startling revelations, the fleet and its Cylon allies have united in a joint search for Earth. They encounter a devastated world where their expectations are shattered by events that echo down the millennia.
When the Admiral proposes the use of Cylon technology to complete a necessary FTL upgrade on all the fleet's ships, he is met with fierce opposition from Zarek, who rallies the Quorum of Twelve to vote with him against a human-Cylon alliance.
Stunned by the near fatal explosion, Saul Tigh and the Admiral are captured once again. Adama is lead before Tom and Felix to be persecuted for his alleged treason.
Unable to move on after the events on Earth, Kara Thrace is still plagued by nightmares. She finds solace in Joe's Bar where a nameless piano player plays music strangely attuned to her pain.
Humans and Cylons have begun working together to repair the Galactica using Cylon resin. But Ellen Tigh's unexpected return causes a rift in the current unity of both races.
In pursuit of the enemy's Resurrection Hub, a misfit team of Viper pilots and Cylon rebels become uneasy collaborators as they formulate a battle plan.
Wartime atrocities dating back to the first Cylon war, and others more recent, haunt Admiral William Adama, young Battlestar Pegasus officer Kendra Shaw, and her mentor Admiral Helena Cain.
Wartime atrocities dating back to the first Cylon war, and others more recent, haunt Admiral William Adama, young Battlestar Pegasus officer Kendra Shaw, and her mentor Admiral Helena Cain.
The thin line that separates humanity from the rapidly evolving Cylons is redrawn as Starbuck returns from the dead with claims that she has found planet Earth.
Galactica's top gun, Kara Thrace, finds herself on the edge of a nervous breakdown as she battles the emotional fallout from her captivity on New Caprica.
Conflicts flare among the Cylons as they confront the taboo mystery of the Final Five and Kara Thrace is pushed too far when her former friends and comrades refuse to believe that she has been to Earth.
After an accident nearly kills President Roslin, Chief Tyrol defies Admiral Adama to demand safer working conditions throughout the fleet - and inadvertently makes himself the rallying point for a strike.