A-77 functioned as an assassin droid serving the CIS, reporting to Asajj Ventress in a mission dedicated to the elimination of Grand Master Yoda.
Count Dooku and Yoda arranged a meeting on Vjun, however, Yoda chose to travel discreetly. When the group consisting of Jedi Masters Jai Maruk and Maks Leem, their respective Padawans, Tallisibeth Enwandung-Esterhazy and Whie Malreaux, alongside the disguised Master Yoda, reached Phindar, they were met by Asajj Ventress and her droid forces, who were lying in wait.
Ventress had learned that Yoda was using a decoy, the performer Palleus Chuff, and threatened to execute him. As Yoda attempted to rescue Chuff, A-77 pursued the Jedi Master with the intent to eliminate him, but Yoda beheaded the droid.