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
Taking place a year after Revenge of the Sith, Wilhuff Tarkin is now a Grand Moff. But when an enemy appears, let's just say crazy shit begins to happen.