Dark Apprentice

The Dark Apprentice, also known as "Starkiller," was a clone of Galen Marek, a Force-sensitive Human male taken on by the Sith Lord Darth Vader as his secret apprentice, also codenamed "Starkiller". Following Marek's death, Vader embarked on a quest to create a perfect, obedient duplicate of the man to take Marek's place. Within the cloning facilities of Kamino, hundreds of failures were produced before the Dark Lord of the Sith succeeded in creating a clone of the deceased apprentice that was able to overcome his template's emotions and submit himself entirely to the dark side of the Force.

As his training progressed, the Dark Apprentice surpassed all those who had come before him; he was able to store Marek's memories independent from his own and suppress the dead man's feelings. Vader planned to have the apprentice face a final test against a rogue clone of Marek during the Rebel attack on Kamino, but the Dark Apprentice did not participate in the battle, and his Sith Master was captured by the Alliance to Restore the Republic.

Text and facts from the “Dark Apprentice” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.