Sam Witwer not only provides the voice and likeness of Starkiller, he also voices Emperor Palpatine, having earned the part during a read through of the script during development.
Sam Witwer would later provide of the voice of Darth Maul in "Star Wars: The Clone Wars".
In the game, Galen Marek/Starkiller is brought back as a clone and is cloned on Kamino. In "Star Wars: Episode II - Attack of the Clones", Kamino was the planet, which was the location of the cloning facility, where bounty hunter Boba Fett and the clone army were cloned from renowned bounty hunter/Mandalorian warrior Jango Fett. Boba Fett appears in the game.