After the devastating Cylon War, the Cylons retreated to parts unknown in deep space, and the twelve human colonies rebuilt that which was destroyed. For twenty years nothing was heard from the Cylons-but sometimes no news is bad news. For the humans, the aftermath of the war has created a new, albeit illegal, profession: scavenger. Tom Zarek is one of these scavengers, scouring the outer settlements for valuable Cylon technologies and artifacts, usually returning empty-handed. But now, he and his crew have found the Omega Station, a secret science facility beyond the edge of charted space, which turns out to be still occupied-by Cylons! The Battlestar Galactica receives the Lightning's distress call, getting the coordinates and a cryptic one-word message: "Cylons." A younger William Adama, just promoted to second in command, is worried. Soon, they will discover the base is full of not just Cylons, but also something much more disturbing...and deadly.