Darth Plagueis
Darth Plagueis, also known as Darth Plagueis the Wise, was a Muun Dark Lord of the Sith, heir to the lineage of Darth Bane and a master of midi-chlorian manipulation, who lived during the century leading up to the Battle of Naboo. Obsessed with eternal life, Plagueis experimented with ways to cheat death and create new life from the midi-chlorians.
He played a large role in galactic events, inciting Darth Sidious, whom he trained in the ways of the Sith and the dark side of the Force, to take control of the galaxy and bring about an age of the Sith. Sidious, concerned with being replaced as Plagueis' apprentice, eventually killed the Muun in his sleep. The legend of Plagueis was later used by Sidious to sway Anakin Skywalker to the dark side, though Plagueis himself remained a mysterious figure to the Jedi and their allies well into the time of the Galactic Alliance.
- Wookiepedia
What else does anyone know of this alien humanoid? I'd like to know more, like who was his master and how did he aquire a young Palpatine? And why or how didn't he sense Palpatine planning his death, as powerful as he was..?