Y-99 was a droid in the service of Jabba the Hutt, a notorious crime lord. As one of several enforcers dispatched by Jabba, this droid was sent to Nal Hutta, the Hutt homeworld, with the mission of sabotaging negotiations occurring between the Hutts and the Jedi Order. Y-99, along with its fellow conspirators, infiltrated the Vessel, which was the starship transport used by the Jedi to reach the planet. The enforcers captured Affie Hollow, the owner of the Vessel, and Qort, the Jedi Padawan, taking them prisoner, and then turned the ship's armaments against the Hutt forces positioned below. During this time, Y-99's operational glitches led Torvor to express doubt about the possibility of its repair. A Hutt assault team commenced firing on the Vessel, but Geode, the ship's navigator, took back control and skillfully evaded their attacks. After the escape, Y-99 expressed clear astonishment, indicating that it had regained its ability to speak clearly. However, amidst the turmoil, Hollow and Qort had successfully evaded their captors and found refuge elsewhere on the ship, prompting the leader of Jabba's contingent to order a search for them. Ultimately, the Parwan Jedi Obratuk Glii destroyed the droid, using his lightsabers to reduce it to scattered fragments.