Darth Sidious ( Ep III: Revenge of the Sith)

He is the secondary Antagonist in Ep III the first being the turned Anakin Skywalker he never revealed himself untill he was conforted by Anakin and in fact he used Anakin with his Manuiplation but Anakin was never aware untill Ep VI but in ep III he is a secondary Antangonist he wipes out all The Jedi with Order 66 and declears himself Emperor of the galaxy.Yoda goes to confort Sidious but unfortunatly for Yoda he was unsucessful Sidious was just too powerful. and unfortunatly for his apperentice he was burned in a fire but what made him smile was Vader's grief over Padme and realising his power and anger was still strong. and after ep III Sidious crushed those who stood in his way for total domination.