"The Cylons began as humanity's robot servants. They rebelled and evolved and now they look like humans. Their plan is simple: destroy the race that enslaved them. But when their devastating attack leaves human survivors, the Cylons have to improvise. The story of two powerful Cylon leaders, working separately, and their determination to finish the task."--Container.

The Colonies' survivors have found their hopes of eluding their Cylon pursuers dashed by an invasion and occupation of their new home. As the fate of all human life hangs in the balance, friends become enemies, enemies become unexpected allies, and decisions are made that will haunt some people for the rest of their lives.

This season finds the twelve colonies caught in a brewing civil war between the followers of President Roslin and those of Commander Adama. They must face the Cylons from outside, and within, the fleet.