Ultimate Fusion (究極の融合) is a futuristic action-adventure video game series created by Anthony Tyler Jr. The gameplay consists of action, adventure, & 3rd person shooter with an optional 1st person shooter mode. The series centers on Xack, the main playable character & protagonist. The series has a mildly inconsistent playable character roster & features a new final boss in each game, however Vittoro & his minions (the primary antagonists of Ultimate Fusion: The Dark Empire) are consistently reappearing opponents in the series.