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.
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.
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.
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.
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.
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.
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.
A rank-free boxing tournament aboard the Galactica is intended to help the officers and crew blow off steam, but it quickly drags old grudges into the light - including Apollo and Starbuck's lingering issues and resentments.
Admiral Adama must confront the darkest moment of his military career when a pilot, believed killed years ago during a secret mission under Adama's command, escapes from Cylon custody and arrives on the Galactica.
As Adama and Laura debate using biological weapons against the Cylons, Baltar is being tortured by D'Anna, intent on determining who is responsible for the virus.
While harvesting algae on the planet beyond the star cluster, the possible discovery of an ancient artefact known as "the Eye of Jupiter" leads to a deadly stand-off with the Cylons.
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.
Weeks without Cylon contact has the Galactica crew breathing easy. As Admiral Adama reflects on the life he's lost, below decks a tragedy unfolds as Tyrol and Cally get stuck on the wrong side on an airlock, with their air leaking away.
The Cylons have begun a brutal crackdown on New Caprica's nascent human resistance movement. With the time running out for the colonists, Admiral Adama must launch his rescue attempt earlier than he'd expected.
The crew of the Galactica and the insurgents on New Caprica coordinate their attacks in a daring attempt to liberate the stranded humans from their Cylon oppressors.
Chief Tyrol's sense of right and wrong is put to the test when he takes part in a secret tribunal that tries and convicts in absentia humans who collaborated with the Cylons on New Caprica - and then secretly executes them for treason.
On the Galactica, movement inside a cargo container draws the suspicion of Tyrol and his deck crew. When the box is opened, a stowaway is found inside, a pregnant 17-year-old girl named Rya Kibby.
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.
Part 2 of 2: The Cylons have occupied the human settlement of New Caprica and it's been three months since the Galactica, the Pegasus, and a handful of ships escaped into deep space. But the fight is not over...
A thriving black market in food, medicine and luxury items has developed within the fleet, serving the rich and depriving the needy of essential goods.
The colonial mining ship Majahual has been working around the clock for a month extracting essential metals from an asteroid. The fleet has moved on, leaving Galactica behind to guard the miners from persistent Cylon raids.
Time passes: more and more of the fleet's population relocates to the surface, leaving only skeleton crews aboard the Galactica and the Pegasus. Through it all, Adama remains uneasy; he anticipates the return of the Cylons.
Part 1 of 2: The Cylons have occupied the human settlement of New Caprica and it's been three months since the Galactica, the Pegasus, and a handful of ships escaped into deep space. But the fight is not over...
The accidental discovery of a habitable planet swings the election in Baltar's favour, while Starbuck's rescue mission to Caprica runs into unexpected trouble.