Ian McDiarmid (born 11 August 1944) is a Scottish actor and director best known for portraying Emperor Palpatine in the Star Wars film series. He has received an Olivier Award for Best Actor and a Tony Award for Best Featured Actor in a Play for his performances. Wikipedia
They primarily focus on the Rebel Alliance trying to free the galaxy from the clutches of the Galactic Empire, as well as Luke Skywalker's quest to become a Jedi and face Sith Lord Darth Vader and his master Emperor Palpatine.