 The Emperor was originally voiced by Clive Revill for that scene, and visually portrayed by Marjorie Eaton.With this addition to "The Empire Strikes Back", McDiarmid has now appeared in every live-action film version in which Palpatine appears.He has also worked with the "Star Wars" expanded universe as the voice of Palpatine in the video game adaptations of "The Empire Strikes Back" and "Return of the Jedi"