Apollo and Starbuck follow the escaped Eastern Alliance ship back to Terra, where they help the Terrans overcome a nuclear holocaust, with the help of the race of white lights that had earlier helped them defeat Count Iblis.
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.