Some interesting trivia tidbits:
Felix Silla (Cousin Itt -The Addams Family) was the person under the robe of Lucifer..the voice was of course ,Jonathan Harris.
Dennis Haysbert ..the spokesman for Allstate Insurance Company.("Are you in good hands?....That's Allstate's stand")was the voice of The Imperious Leader in episode #9 "Space Croppers" of the Galactica 1980 seies.
Murray Matheson, the Australian actor (recognized as "the clown" from the Twilight Zone episode #79, 1961 "Five Characters In Search of an Exit") was the voice of the IL series Cylon droid "Specter"
Dick Durock, ex marine,actor and stuntman(best known for his 'Swamp Thing" role) was underneath the Imperious Leader's costume. It was not just a "puppet"
Lorne Greene so loved his role as Adama, that (even though not cast)he pleaded to reprise his role in Galactica 1980, and worked unpaid in the short lived series.
John Colicos (Count Baltar) after BSG ended, later acted in the soap opera "General Hospital" as mad scientist Mikko
Cassadine who tried to freeze the earth.
Trivia is fun !!