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Acting
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: Tales of the Jedi
as Darth Sidious (voice)

Obi-Wan Kenobi: A Jedi's Return
as Self - Emperor Palpatine

Obi-Wan Kenobi
as Emperor Palpatine / Darth Sidious

Star Wars: The Bad Batch
as Darth Sidious / Emperor Palpatine (voice)

Star Wars: The Clone Wars - The Siege of Mandalore
as Darth Sidious (archive sound) (voice)

The Skywalker Legacy
as Self

Star Wars: The Rise of Skywalker
as Emperor Palpatine

Britannia
as King Pellenor

The Lost City of Z
as Sir George Goldie

Star Wars: Greatest Moments
as Self

Star Wars: Evolution of the Lightsaber Duel
as Self

Star Wars Rebels: The Siege of Lothal
as Emperor Palpatine (voice)

Star Wars Rebels
as Emperor Palpatine

37 Days
as Sir Edward Grey

Utopia
as Anton
The Odds

Margaret
as Denis Thatcher

Star Wars: The Clone Wars
as Darth Sidious (voice) (archive sound)

City of Vice
as Henry Fielding
Our Hidden Lives
as B. Charles

Elizabeth I
as Lord Burghley

Star Wars: Episode III - Revenge of the Sith
as Chancellor Palpatine / Darth Sidious

Star Wars: A Musical Journey
as Host

The Story of Star Wars
as Palpatine/The Emperor (archive footage)

Charles II: The Power and The Passion
as Sir Edward Hyde

Star Wars: Episode II - Attack of the Clones
as Chancellor Palpatine

Spooks
as Prof. Fred Roberts

Crime and Punishment
as Porfiry

Crime and Punishment
as Porfiry

The Beginning: Making Episode I
as Self

Sleepy Hollow: Behind the Legend
as Self

Sleepy Hollow
as Dr. Lancaster

All the King's Men
as Rev. Pierrepoint Edwards

The Adventures of Young Indiana Jones: Demons of Deception
as Prof. Levi

Star Wars: Episode I - The Phantom Menace
as Senator Palpatine

Great Expectations
as Jaggers

Great Expectations
as Jaggers

An Unsuitable Job for a Woman
as Ronald Callender

Touching Evil
as Ronald Hinks

Hillsborough
as Doctor Popper, Coroner

Karaoke
as Oliver Morse

Restoration
as Ambrose

Annie: A Royal Adventure
as Dr. Eli Eon

Heart of Darkness
as Doctor

Chernobyl: The Final Warning
as Dr. Vatisenko

Dirty Rotten Scoundrels
as Arthur

The Modern World: Ten Great Writers
as Dostoevsky

Inspector Morse
as Hugo De Vries

Pity in History
as Murgatroyd

Gorky Park
as Professor Andreev

The Nation's Health
as Dr Vernon Davis

Return of the Jedi
as The Emperor
Last Night Another Dissident...
as Fedka

Dragonslayer
as Brother Jacopus

Richard's Things
as Burglar

Sir Henry at Rawlinson End
as Reg Smeeton

The Awakening
as Dr. Richter

Macbeth
as The Porter / Ross

The Professionals
as Mickey Hamilton

The Likely Lads
as Vicar