Ian McDiarmid as Sheev Palpatine - Star Wars: Episode V - The Empire Strikes Back (2013 Recast) Fan Cast | myCast.io
Ian McDiarmid
Age: 81
male
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
Star Wars: Episode V - The Empire Strikes Back (2013 Recast)
The Original Trilogy if it had been remade after Revenge of the Sith came out. I've always thought it would be neat to see the living characters from the prequel era played more by their younger actors.
The new OT actors, would, in turn, play those characters in Rogue One, Kenobi, and more.