TN-123 was a T-series military strategic analysis and tactics droid of masculine programming who served within the Separatist Droid Army of the Confederacy of Independent Systems as a commander during the Clone Wars. In 21 BBY, during a prolonged battle of attrition on the planet Malastare, the droid commander came to the conclusion that his droid army had been able to surround the Galactic Republic's forces commanded by Jedi Generals Mace Windu and Anakin Skywalker at the Dug species' palace. However, despite his droid forces' capabilities of succeeding in an attritional battle, TN-123 was deactivated alongside the rest of his army during the engagements following the Republic's deployment of the electro-proton bomb.
TN-123 was introduced in "The Zillo Beast," the eighteenth episode of the second season of the Star Wars: The Clone Wars television series, which aired on April 9, 2010. The droid was later first identified in the 2021 reference book, Star Wars: Battles that Changed the Galaxy.
- Star Wars: Battles that Changed the Galaxy