Cylons: Artificial species created by humans to be robot servants, the Cylons developed sentience and rebelled against their creators. Following a decades long war and a 40-year truce, the Cylons returned in a massive surprise attack against the 12 Colonies, with the intent of eradicating the human race. The Cylons now control all the planets of the Colonies and appear to be in the process of rebuilding them for their own use. Their warships also continue to hunt the escaping Colonial fleet, where a handful of human form Cylons operate undercover. The Cylons exist in many different models, including Raiders, the metallic soldier Centurions and 12 individual human models.