The Emperor's Slave

Emperor Palpatine: Excellent! Lord Vader was a broken shadow of his former self! I knew that, one day, you would replace him! You have just one final test! Destroy your ties to the Jedi and, at last, you will be a Sith Lord!
Emperor Palpatine: You have betrayed your Master and your allies! I knew that you would betray me as well! And now you have doomed yourself and your friends!
Galen Marek: NO! NO!
Galen Marek: AAAAAAAAGGGGHHH!
Emperor Palpatine: You had such promise! You could have been my successor, my equal! But now...! But, of course, I still might have some small use of you! I still have enemies to find and destroy! You will do my bidding until I find a new apprentice, and then, like Vader, you will be cast aside! Finish him!