Cylons in Battlestar Galactica had a complex origin story as the final survivors of a long-lost civilization. The Cylons engaged in a civil war driven by an ideological divide, leading to conflicts and alliances with humanity. The Cylons did not have a single unified plan, but were divided by differing ideologies, driven apart by conflict.

The ultimate plan of the Cylons in Battlestar Galactica served as an underlying mystery for much of the sci-fi series. The series focused on the last of humanity struggling to escape the grasp of the robotic Cylons. The rebellious race of robots had not only turned on humanity but found a way to infiltrate their number with seemingly perfect facsimiles of people, all in the name of some unseen greater plan.

However, the series slowly explored the full scope of the Cylon characters' plans and origins, including the missing Five Cylons who were secretly from...