While Commander Adama leads the rag-tag fleet of ships to the planet Kobol, where he hopes to find clues of Earth's location, the Viper pilots contract a disease, making it necessary for the women to take on fighter patrol duties. But the traitor Baltar leads the Cylons in an attack on the Galactica.

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.

Baltar attempts to lure Galactica into range of a gigantic pulsar cannon. Adama becomes aware of the trap and sends in a team of commandos to destroy it.

Apollo and Starbuck lead a group of convicts on a possible suicide mission to destroy the cannon, which is located on an icy planet.