Supreme Leader was a military title used by the Dark Acolyte Asajj Ventress, a Force-sensitive who served the Confederacy of Independent Systems' head of state, Count Dooku, as both an assassin and a commander in the Separatist Droid Army. Put by her master in command of an army, the Supreme Leader deployed a battalion of battle droids against Yoda in an effort to kill the Grand Master of the Jedi Order to daunt King Kattuunko of Toydaria into siding with the CIS. However, Yoda defeated the Separatist droids with the help of the diplomatic service clone troopers and confronted Ventress in person, causing Count Dooku's deadly operative to flee from Rugosa.