The Cylons were created by a reptilian race, also called Cylons. The reptilian Cylons allowed themselves to be overcome by their own technology upon the creation of the Imperious Leader. The robotic Cylons became an organized war machine bent on exterminating life in the galaxy. Despite the fact that the reptilian Cylons had long since been wiped out, their robotic creations still bear their name.  The Cylons are singularly devoted to the destruction of humanity.

The Thousand Yahren War between the humans of the Twelve Colonies and the Cylons began when the Colonials liberated the Hasari from Cylon rule. The Cylons then viewed humanity as a threat to their Empire and proceeded to attack Colonial installations. The Cylons and the humans fought for roughly one thousand yahren with losses on both sides. The final end to the war occurred after the Cylons proposed peace through the mediation of Baltar, a member of the Quorum of Twelve. However instead of concluding peace the Cylons destroyed the human Battlestar force in the Battle of Cimtar and also attacked the Colonies killing most inhabitants. Baltar who had intended to use the Cylons to subjugate his colony under his rule, saw his colony destroyed too and barely escaped execution. The rag-tag, fugitive fleet being led by the last known surviving Battlestar, Galactica fled their homeworlds avoiding the Cylon genocidal attacks. Sparing Baltar's life the newly ascended Imperious Leader gave him the command of three basestars and a cogitator, Lucifer. With Baltar pursuing the Fleet Galactica and the 220 ships she led from their aggressors avoided Cylon death traps and all out attacks. Eventually a daring, successful attack on a lone basestar led Adama to believe that they may have outwitted the Cylons who had apparently spread their resources thin in an attempt to locate the remaining humans.

Species Name: Cylon

Type: Humanoid Robot

Physical Traits: Metallic, chrome skin.

Height: 6 ft

Weight: 200 lbs

Mobility: Legs

Sensory Organs: Visual

Communication: Vocal

Reproduction: Construction

INT: 3D6, WIS: 3D6, STR: 3D6, DEX: 3D6, CON: 3D6, CHA: 3D6, MR: 3D6, HPs: CON +D20. Stats are

Orbit/Climate: 1 AU. Very stable, circular orbit, very stable surface temperature.

Atmosphere: Standard Oxygen/Nitrogen with significant ozone component in the stratosphere.

Oceans: 40%

Gravity: 100%

Feeding Habits: Energy

Lifespan: 200 years

Technology: 9. Cylons employ several spacecraft models such as;

Basestar - Capital ships of the Cylon military force, analogous to the Colonial battlestar. A large warship mounting two pulsars, many laser turrets, and carrying 300 Raiders.

Cylon Raider - The primary fighter of the Cylon forces, manned by two pilots and a ship commander. A heavy fighter armed with dual-firing laser cannons.

A-B Raider - An advanced variation of the Raider, crewed by three Centurions and two Cylon Androids.

Cylon Freighter - Ships used throughout the Cylon sphere of influence to provide fuel. May be used to support an offensive operation.

Cylon Tanker - A ship for transporting the fuel "tylium".

Culture: The Cylons are a malevolent, truly malicious race with no redeeming qualities at all. The Cylon Empire is also responsible for tributary powers under the aegis of the Cylon Alliance. The Ovions  are an insectoid race enslaved by the Cylons and transported to the planet Carillon for mining purposes, the only other known race conquered by the Cylons are the Delphians and Hasaries. Cylon society appears to be almost exclusively military.

Centurions appear to be incapable of acting independently having to refer to the manual in order to determine courses of action. Failing that, Centurions often take votes when consensus isn't clear. In addition they do not appear to have much information on humans outside of the different genders and general language. The Cylons are entirely composed of robots, and may be broken down by the following model and rank types;

Imperious Leader - rules the Cylon Alliance and is the highest Cylon model. The Imperious Leader is an IL-Series Cylon with some extra augmentation, including a third brain and a body shell resembling the reptilian Cylons. The third brain is specifically designed to emulate the human mind (solely for the purpose of anticipating human actions).

IL-series Cylon - act as commanders for the military and governors for civilians of the Alliance. They have two brains and a mostly transparent head through which various lights can be seen pulsing. They also have a metallic, humanoid face with two eye scanners (compared to the single eye scanner of the Centurion models) and wear clothing (full-length glittering robes).

Command Centurion - are Centurions with gold armour. These are the lower commanders for individual military units though they can be responsible for entire Basestars and garrisons. Their voices are slightly lower pitched than regular Centurions.

First Centurion - roughly equivalent to feudal Counts which act as executive officers to the Imperious Leader and are not subordinate to the IL-Series and (like the IL-series) have multiple brains. They are distinguished from other Command Centurions by black bands on their gold armour.

Centurion - Military androids with silver armour. Basic Centurions make up the ground forces and pilots of the Alliance military. Centurions are armed with a powerful energy weapon, often referred to as a blaster rifle. They also have bayonets and swords for close combat and the execution of prisoners. Although Earth's Roman Centurions commanded a unit of eighty men Cylon Centurions form the rank and file of the Cylon forces.

Civilian Cylon - There is also a unique Cylon with glittering robes and a metallic humanoid face. How civilian Cylon society differs from its military is never explored.

Government: Military Dictatorship ruled by Imperious Leaders.

Population: Unknown but supposedly in the billions.

Home System:

Number of Stars: 2, location unknown

Star Type: O

Planetoid Belts: 7

Inner Planets: 1

Middle Planets: 4