Count Dooku: The force is with us, Master Sidious.
Darth Sidious: Welcome home Lord Tyranus. You have done well.
Quotes from Ian McDiarmid movies and TV shows
Count Dooku: I have good news for you, my lord. War has begun.
Darth Sidious: Excellent. Everything is going as planned.
Darth Sidious: [To Yoda.] I've been waiting a long time for this, my little green friend.
Darth Sidious: The time has come. Execute Order Sixty-Six.
Darth Sidious: At last the Jedi are no more.
Yoda: Not if anything to say about it I have. At an end your rule is and not short enough it was.
Chancellor Palpatine: Do it!
Chancellor Palpatine: I am the senate!
Mace Windu: You are under arrest, Chancellor.
Senator Palpatine: Are you threatening me, Master Jedi?
The Emperor: Every single Jedi, including your friend Obi-Wan, is now an enemy of the republic. Do what must be done.
The Emperor: You will soon become a very powerful Sith. Henceforth, you shall be known as Darth...Vader.
Anakin Skywalker: Thank you, my master.
The Emperor: Rise.
The Emperor: If you will not be turned, then you will be destroyed!
The Emperor: If you cannot be turned, then you will be destroyed.