The film is set three years after Star Wars. The evil Galactic Empire, under the leadership of the villainous Darth Vader, is in pursuit of Luke Skywalker and the rest of the Rebel Alliance. »
The purge officially began with Order 66 following a botched attempt by Mace Windu and three other Jedi to arrest the chancellor. »
"Good…Good. The Force is strong with you. A powerful Sith you will become. Henceforth, you shall be known as Darth...Vader." »