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.
When the 12 Colonies of Man are wiped out by a cybernetic race called the Cylons, Commander Adama and the crew of the battlestar Galactica lead a ragtag fleet of human survivors in search of a "mythical planet" called Earth.