seen by anyone. Imperious Leader The Imperious Leader, voiced by Patrick Macnee, is the leader of the Cylon Alliance and most advanced Cylon model. According to the IL-Series Cylon Lucifer, the Imperious Leader is an IL-Series Cylon. One Imperious Leader was killed in the pilot episode at the Battle of Carillon and subsequently replaced by another. The Imperious Leader has a third brain and a body shell resembling the reptilian Cylons. The original novelization of the pilot episode states that the Imperious Leader's third brain is specifically designed to emulate the human mind (solely for the purpose of anticipating human actions). IL-series Although they look much more civilian than centurions, IL-series Cylons 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). Two IL-series Cylons have been featured onscreen, both of which have an effete human-sounding voice, unlike the flat mechanical tones of Centurions. They are: Lucifer—Baltar's ambitious second in command (voiced by Jonathan Harris). Specter—Commander on the planet Atilla in "The Young Lords", and a rival of Lucifer and equally ambitious (voiced by Murray Matheson). Two additional IL-Series Cylons are shown on-screen on the Cylon capitol of Gamoray during the Imperious Leader's visit, which occurred during the episode "The Living Legend, Part II". Lucifer refers to the second Imperious Leader as being upgraded from an IL-model like himself. Centurion Military androids with silver armor. Basic Centurions make up the ground forces and pilots of the Alliance military. Although Earth's Roman Centurions commanded a unit of eighty men, Cylon Centurions form the rank and file of the Cylon forces. 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. The Centurions were initially depicted in preproduction art by artist Ralph McQuarrie, but the final design was largely the work of Andrew Probert. Similarities with the McQuarrie-derived look of the Imperial Stormtroopers are sometimes suggested as a factor that prompted 20th Century Fox's lawsuit for copyright infringement against Universal Studios, owners of the Battlestar Galactica copyright. However the 9th Circuit Court of Appeals did not