Darth Sideous

Darth Sideous is a great and powerful Sith Lord. He was the master of Darth Maul, Count Dooku and Darth Vader. Darth Sideous killed his own master and he was the ruler of the Sith. He was pretending to be in the Jedi's side during Episode 1 and 2. He was pretending to be in the Senate and he was called Chancellor Palpatine. During Episode 3 the Jedi figured out that Chancellor Palpatine was really Darth Sideous. Darth Sideous escaped with his new apprentice, Darth Vader and started to make a new base which was the Death Star. At Episode 6 Darth Vader had killed Darth Sideous, because Darth Vader was turning to the Jedi side.

This is Darth Sideous