For the "Forces of Corruption" expansion pack, he took greater creative liberty with the "Star Wars" feel by writing an original theme for the new criminal faction. In attempting to compose this piece, he wrote several preliminary hooks that were later integrated into the game's battle themes. He composed six pieces for the expansion total, including the finale theme. In line with the criminal theme of the game, Klepacki borrowed motifs and recreated the mood from scenes involving Jabba the Hutt in "Return of the Jedi". His score for the expansion pack was accepted upon first submission to LucasArts. As Petroglyph's audio director, he also selected sound effects—a tricky process due to the issue of making the criminal faction's sounds a "little different, without straying too much from the original signature sounds." Klepacki worked with LucasArts to select voice actors, and contributed his own talents to the role of IG-88 and other minor characters. A blooper reel of his voice acting was released on Petroglyph's forums after the one-thousandth member registered. Klepacki was contacted to score "Command & Conquer 3", but was too busy with duties at Petroglyph and declined to mention the offer publicly. Electronic Arts hired Steve Jablonsky to score the game; an EA community manager at "C&C 3"'s forums suggested that the audio team studied Klepacki's music and tried to recreate his style. Klepacki feels that "Command & Conquer" is a significant part of his life and that he would like to return to the "Tiberian" era. He conceded that employment at Petroglyph games would probably prevent him from working with Electronic Arts. Years later in 2018 he would have that opportunity due to EA partnering with Petroglyph to remaster the games since many of the former developers from Westwood Studios had started, and continue to work at, Petroglyph.