The Cylons are the main antagonists of the human race in the Battlestar Galactica science fiction franchise, making appearances in the original 1978 series, the 1980 series, the 2004 re-imagining, and the spin-off prequel series Caprica. In the 1978 series, Cylon is also the name of the reptilian race who created the robot Cylons. The nature and origin of the Cylons differ greatly between the two Battlestar Galactica continuities. Both series feature Cylon Raiders, Cylon Basestars and Cylon Centurions. The prequel series, Caprica, focuses on the creation of the Cylons. Original Cylons In the original 1978 series, Cylons are a race of robots at war with the Twelve Colonies of humanity. The Cylons were created by a reptilian race, also called Cylons, that died out centuries before the series takes place. In the episode "War of the Gods", Count Baltar mentions that the reptilian Cylons were ultimately "overcome by their own technology" (particularly after the Imperious Leader was created, despite having had a "slight error" in its programming), and recognizes Iblis's voice as that of the Cylon leader, and Iblis counters that if that were true, it must have been "transcribed" over a thousand yahren (years) ago. At the beginning of the series the Cylons are singularly devoted to the destruction of humanity. The war started when the Cylon Empire sought to expand into the territory of the Hasaris, and the Human Colonies intervened on behalf of the conquered Hasaris. Due to those events, the Cylon Empire now viewed the entire human race as a target. Cylons are led by the Imperious Leader, an IL-Series Cylon elevated to a supreme leadership position over all Cylons. All Cylons, from the IL-series down, typically repeat the phrase "By Your Command" when responding to any order. The Cylon Empire is also responsible for tributary powers under the aegis of the Cylon Alliance. The Ovions (an insectoid race enslaved by the Cylons and transported to the planet Carillon for mining purposes) are the only known member of the Cylon Alliance shown onscreen. Aside from the Ovions and (the defeated) Hasaris, the only other known race conquered by the Cylons are the Delphians, which are mentioned to have been exterminated in "The Living Legend." Cylon society appears to be almost exclusively military. Until the discovery of Gamoray, which the Colonial fleet had targeted for its rich fuel reserves, no civilian Cylon outpost had ever been