The Colonials survive on New Caprica under Cylon rule, with some collaborating and others fighting back. On board the Galactica, Adama and his skeleton crew debate whether or not to return for the majority of the survivors of humanity.

The Colonials survive on New Caprica under Cylon rule, with some collaborating and others fighting back. On board the Galactica, Adama and his skeleton crew debate whether or not to return for the majority of the survivors of humanity.

Sharon is sent from Galactica to coordinate the escape from New Caprica, and must infiltrate Cylon headquarters to recover the fleet's launch keys. Saul Tigh learns disturbing news about his wife.

The Galactica launches its mission to rescue the inhabitants of New Caprica against all odds, leading to a final showdown between the human survivors and their Cylon oppressors.

In the wake of the Cylon occupation, a secret group of men and women play judge, jury, and executioner to those who collaborated with the enemy on New Caprica. Tom Zarek and Laura Roslin negotiate for her to reassume the office of the President.

Baltar must prove his value to the Cylons when a Base Ship is infected with a mysterious plague. A vital clue about the path to Earth is found, and Admiral Adama confronts two crew members who are sowing discord.

The crew capture a group of Cylons infected with the deadly virus, and plan to spread the plague by executing them while within range of a Resurrection Ship. Baltar is tortured when his betrayal of the Cylons is discovered.

Bill Adama is forced to confront his past actions when a pilot from his previous command miraculously turns up alive -- after a black ops mission into Cylon territory.

A no-rank boxing tournament allows the crew to relieve tensions, especially between those who settled on New Caprica and those who stayed on Galactica -- and gives Kara and Lee a chance to confront their own history.

The fleet undertakes a dangerous series of jumps through deadly radiation to reach a food source after the food-processing machines are contaminated. Kat comes face to face with her secret past.

After the crew discovers the legendary Temple of Five on the algae planet, the Colonials and Cylons reach a stand-off in the hopes of finding a object that is said to lead the way to Earth.

As the Colonial fleet and the Cylons jockey for position over the algae planet, Lee considers putting their position on the surface at risk by rescuing Kara. Sharon takes a drastic action to be reunited with her baby.

As a prisoner on board the Galactica, Baltar considers the very real possibility that he is a Cylon. Kara and Lee reconsider their respective marriages.

Helo searches for the truth when the Saggitarons suspect that a ship's doctor is discriminating against them in medical care, but finds himself on the outside when no one believes him.

On his wedding anniversary, Bill Adama is haunted by the memory of his late wife and the fate of their marriage. Tyrol and Callie are trapped in a compartment with an oxygen leak.

When the workers at the fuel refinery threaten a work stoppage, the Admiral sends Chief Tyrol in to get things flowing again. Baltar sows dissension in the fleet by publishing a personal manifesto.

Kara is haunted by memories of her past, and reports seeing a Cylon raider that no one else can detect -- causing Lee and Admiral Adama to question her fitness for duty.

After Baltar's lawyer is killed by a terrorist, Lee is assigned to run security for his replacement -- a brilliant and manipulative legal strategist.

As Baltar's high-profile trial begins, Lee must decide whose agenda he will serve. Several fleet members are haunted by a song they hear throughout the ship.

Baltar's trial takes a turn as Lampkin begins his defense, putting Lee Adama himself on the stand. Four people in the fleet discover the ultimate secret about themselves.