Lord Zedd

Name is

Lord Zedd was the self-proclaimed, all-powerful "Emperor of Evil" and "sworn enemy of all that is good and decent". Not much is known of his life before attacking the Earth, but several details emerged: http://www.esnips.com/nsdoc/eaf99e89-6886-45d3-b490-b3489c27a3c2/?action=forceDL
 * Over a period of time, he conquered a large portion of space. His distant conquests occupied his attention away from Earth for centuries at a time, which was why he ordered his subordinate (and future wife), Rita Repulsa, to conquer the blue planet.
 * He developed an intense rivalry with Count Dregon, the evil uncle of the Masked Rider, at some point in the past. (Dregon was introduced in third season at the same time as the Masked Rider, but never appeared again in the series. This information was summarily ignored after the introduction of Dregon and his nephew Dex, who was the Masked Rider, who would later appear in their own series, Saban's Masked Rider.)
 * He once made an attempt to claim the Zeo Crystal from the moon's Caves of Deception, but couldn't penetrate the forcefield.
 * The moon palace that he occupied while attacking Earth was not built by him or his subordinates, but his evil did corrupt it.