The world ended with no warning, and all that was left… was hope.A truce between the humans of the Twelve Colonies and the Cylons—intelligent robots designed by humankind—lasts for 40 tense and silent years. Battlestar Galactica picks up just as the Cylons commit mass genocide against humanity. Only the Battlestar Galactica (an old warship about to be decommissioned and turned into a museum) and those souls fortunate enough to be aboard other starships were able to survive the attack. In the aftermath, the Galactica's commanding officer, William Adama, finds himself responsible for safeguarding the last remnants of the human race—fewer than 50,000 desperate survivors. Meanwhile, the annihilation of the Colonial government results in the succession of the Secretary of Education, Laura Roslin, to the presidency. Driven by prophetic visions and political necessity, the Galactica travels through uncharted space in hopes of finding the mythical, lost 13th colony—Earth.
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Daybreak, Part 2 04x20
A stripped down Galactica attacks the Cylon's Colony ship in the hopes of rescuing Hera. The meaning of the shared dream in the Opera House on Kobol is revealed. Sam Anders is moved in his Hybrid tank to the CIC in the hopes that he will be able to assist the combatants.
Daybreak, Part 1 04x19
The Colony is located sitting on the edge of a black hole with only one point of entry in what is a very large debris field. Knowing that the Galactica has reached the end of the line, Admiral Adama asks for volunteers to mount a raid on the Cylon base, realizing it may be the ship's last jump. In flashbacks prior to the Cylon invasion, key moments in the lives of several of the crew are presented.
Islanded in a Stream of Stars 04x18
With Hera now likely in the hands of John Cavil, Admiral Adama sends out search teams to locate The Colony, the Cylon home world if you will, that Ellen Tigh says is the only place she imagines she could be. Adama reluctantly comes to the conclusion that the Galactica has reached the end of its days. He orders all repair activities halted and decides to strip the ship and share everything that is salvageable with the rest of the fleet. Starbuck meanwhile shares with Gaius Baltar what she found on the uninhabitable Earth.
Someone to Watch Over Me 04x17
Kara meets a pianist who reminds her of her father. She tries to play a melody she remembers from her childhood, and a drawing made by Hera helps her. Meanwhile, Boomer is to be tried for treason. Tyrol takes her side, and helps her escape.
Ellen and Boomer travel to the Galactica. Saul is entranced at the sight of his wife while Adama puts Boomer in the brig. Ellen is not so pleased when she learns that Caprica Six is pregnant by Saul. Her interference and jealousy leads Six to have a miscarriage. Sam Anders survived the operation but now seems to be brain dead. Ellen is disappointed that the Final Five cannot be completely reunited. By majority vote, the Five agree that they will go off on their own, leaving the Colonial Fleet behind.
No Exit 04x15
Eighteen months ago: Saul poisons Ellen, who then finds herself downloaded into a new body aboard a Cylon Base Star, with a single Centaurion keeping watch over her. After the initial shock, she has a revelation as she remembers things she had forgotten. Present Day: Dr. Cottle is operating on Anders, who has a bullet lodged in his brain. Anders starts to remember things he had forgotten.
Blood on the Scales 04x14
Roslin is on board a raptor en route to the Rebel Cylon Base Star, but Gaeta has ordered to engage and destroy it. The marines have used a stun grenade on Adama and Tigh. Roslin manages to get a wireless transmission out for everyone to hear and learn what Gaeta has done. She and the others barely make it to the Base Star, where she convinces Tory and the other Cylons to use the Fleet as a cover in order to prevent Gaeta from attacking it. She also believes that Adama will be able to save the rest of the Final Four.
The Oath 04x13
The Fleet refuses to cooperate with Cylon engineers and Adama decides to put and end to it. He sends the Quorum a message stating that unless they wish to join Zarek in the cell, they get their people in line. However, Gaeta is already freed Zarek with the help of other would-be-revolutionists. They allow Zarek to leave Galactica on a raptor. He lands on Colonial One and enters a gathering of the Quorum. Meanwhile, Anders gets ambushed and captured. At the CIC, Gaeta cleverly manipulates everyone else until the time is at hand for the revolution to begin.
A Disquiet Follows My Soul 04x12
Adama considers Saul and Tyrol's suggestion that the Fleet should integrate Cylon jump technology since it will triple the distance they will be able to cover before they run out of fuel. But the Cylon's condition is that they will be allowed to join the Fleet, for safety against Cavil, who's still out there. Ultimately, the decision is up to President Roslin, but Zarek calls the Quorum and gets them to carry the motion that no Cylon be allowed aboard any Colonial vessel unless permitted by the ship's captain.
Sometimes a Great Notion 04x11
Scouting the planet reveals that there is no life except plants. The destruction occurred about 2,000 years earlier. Among the ruins, skeletons and wrecks of a different kind of Centurions are found. But closer examination of the skeletons reveals they are Cylon! Could the 13th Tribe really have been all Cylons? Chief Tyrol, Colonel Tigh, Sam Anders and Tory remember living on the planet and dying there.