The Cylon brothers, led by Cavil, launch a coordinated attack on the twelve colonies, but ultimately fail to eradicate humanity. Instead, they resort to deception, infiltrating remaining communities, including the Battlestar Galactica and a human training class on Caprica. As both sides fight for survival, they must also confront existential and practical challenges.

The Plan
The twin Number Ones, Cavils, are tasked with wiping out humanity after their initial Cylon assault falls short of its goal.