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Presenting Darth Plagueis the Wise from the Star Wars Black Series Toyline.
We seem to have quite a collection of Sith joining the Dungeon:
Darth Krayt,
Darth Vader,
Darth Malgus,
Ulic Qel-Droma,
Darth Nihl,
Darth Maul,
Mother Talzin,
Darth Talon, etc...
But this Sith Lord is... special.
If you were impressed with the way Emperor Palpatine beat the crap (Debatable) out of the leaping, lunging, twirling little green goblin called Master Yoda, Darth Plagueis the Wise is the guy that trained Palpatine.
Darth Plagueis the Wise, a Munn Sith Lord who can trace his lineage all the way back to Darth Bane is also, like Palpatine, a Sith Lord who hides in public. He maintained his identity as Hego Damask, Magister of Damask Holdings head of the InterGalactic Banking Clan (One of the groups that led to the Galactic Civil War).
A master manipulator of midi-chlorians, Darth Plagueis was obsessed with cheating Death and creating new life using the Dark Side of the Force (He once amused himself by bringing his rival back to life several times just so he could kill him again-and-again).
His attempt to create life through the Dark Side back-fired (In a manner of speaking), the Force fought back and created the fatherless conception of Anakin Skywalker.
In effect, this is Anakin Skywalker's Daddy.