The Cylon Empire tricks the Twelve Colonies into believing they are suing for peace, they ambush the unprepared colonies and destroy the Battlestar fleet. The only surviving Battlestar, the Galactica under the command of Commander Adama, gathers the surviving humans from the colonies and leads them in search of the legendary 13th colony: Earth.moreless
As Adama becomes more suspicious of the good fortune provided by Carillon and the Ovians, Sire Uri uses an award ceremony for the warriors who delivered them to Carillon as a front for proposing a disarmament treaty with the Cylons.
At Apollo's bachelor party, a mysterious virus, brought back from an asteroid, infects most of Galactica's fighter pilots forcing it to recruit shuttle pilots (mostly women) to replace them. Adama must risk everything to send these new pilots, with the doctor, back to the asteroid to find the cure. Meanwhile, he considers sending the Galactica and the fleet into a large void in space that is devoid of life and light.moreless
While Commander Adama leads the rag-tag fleet of ships to the planet Kobol, where he hopes to find clues of Earth's location, Starbuck is taken prisoner by the Cylons as an important part of a renewed peace plan plot by Baltar.
Apollo is marooned on a Western Frontier-like planet, where he meets a woman and her son ... and a damaged Cylon, known as Red Eye, who has become a notorious gunslinger.
Starbuck is assigned to test a new ultra-fast, but unarmed, Viper with a talking computer named C.O.R.A. When he meets a bootlegger, who steals the Viper, Starbuck finds himself arrested by the Galactic Police of a prison planet.
Baltar attempts to lure the Galactica into range of a gigantic pulsar cannon. Adama becomes aware of the trap and sends in a team of commandos to destroy the cannon.
Apollo and Starbuck lead a group of convicts on a possible suicide mission to destroy the cannon, which is located on an icy planet.
When a Cylon attack destroys most of the fleet's food supply, Galactica must trade equipment for grain on a rural planet plagued by the Borays, a group of pig-like marauders.
Starbuck crashes on the planet Atilla, where the Cylons have destroyed all the humans except for a band of children, who have become warriors to save their enslaved father.
The fleet is buoyed by the appearance of the battlestar Pegasus, led by Commander Cain, which was thought to have been destroyed two years earlier. Cain and Adama clash over strategies and Cain takes drastic action to accomplish his goals.
The brash Commander Cain insists that the Galactica join in on a frontal attack on the Cylons, an attack that Adama believes would be a suicide mission. Adama decides to send a commando force, comprised of personnel from both Battlestars, to a Cylon planet to get the fuel needed to escape Baltar's trap.moreless
A Cylon kamikaze attack leaves the Galactica burning in space, with no way to extinguish the blaze that has trapped Boomer, Athena, and Boxey except by a dangerous space walk by Apollo and Starbuck.
When Silver Spar disappears on patrol, Apollo leads Starbuck and Sheba to investigate a planet in the vicinity. On the surface they find the wreckage of a large ship and meet the mysterious Count Iblis, who somehow survived the crash. Iblis offers to deliver them from their enemies and show them the way to Earth if they will follow him.moreless
Count Iblis gains overwhelming popularity with the Council, but Commander Adama remains unconvinced. He sends Apollo, Starbuck and Sheba back to the planet where they found the Count to investigate and find out the truth about Iblis before it is too late.
Aboard the Rising Star, one of Starbuck's gambling schemes is salvaged when he meets an old con man named Chameleon who hints that he might be Starbuck's long-lost father. Chameleon is using the con in order to seek refuge onGalactica from a trio of Borellians who are on a blood hunt for him in revenge for a past con.moreless
When Starbuck's rival in a popular sporting event is found murdered, all the evidence points to Starbuck as the culprit. Apollo defends his friend at trial even as others race to find the real killer and prove Starbuck's innocence.