TJ-912 took part in the Battle of Sullust. She was ordered by Count Dooku to destroy the command ship of Asajj Ventress to execute the assassin, as Darth Sidious wanted her killed. After TJ-912 was ordered to have her fleet retreat.
TJ-912 later served under General Grievous when he went to conduct negotiations with the Gungans on Naboo. After the negotiations were revealed to be a trap and Grievous was captured, TJ-912 took part in a prisoner exchange to trade Anakin Skywalker for the cyborg General.