Count Dooku
In "", Yoda hears Qui-Gon's voice cry out to Anakin through the Force as Anakin slaughters a tribe of Tusken Raiders. Obi-Wan discovers that Qui-Gon's old master, Count Dooku, has become a Sith Lord; and Dooku mentions Qui-Gon as he interrogates a captured Obi-Wan, expressing grief over his former apprentice's death and arguing that Qui-Gon would have followed him in leaving the Republic had he survived.