Chancellor Palpatine is revealed to be Darth Sidious, kills Jedi Masters Mace Windu (presumed), Saesee Tiin, Kit Fisto , and Agen Kolar, and creates the Galactic Empire with himself as Emperor . Anakin Skywalker turns to the dark side, and becomes Darth Vader . The Great Jedi Purge is orchestrated by Palpatine