Erebus
From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
Lord Erebus was an Imperious Leader from the Video Game. He lead the Cylon forces against the Twelve Colonies during the beginning of the Cylon War, and was especially interested in Lt. William Adama, whom it was believed would one day lead the Colonials (and thus, the Cylons) to the lost tribe of Colonists.
Erebus was voiced by Dwight Schultz, who starred in "The A-Team" with Dirk Benedict.