T-3PO was a blue-colored protocol droid who served on Trevura, during the Galactic Civil War. T-3PO served under S-R6, an assassin droid who moved about Voma, a city on Trevura, in order to buy illegal and experimental versions of Imperial blasters that were imported by Merno Blask, the governor of Voma.

It was later discovered that T-3PO was reprogrammed to be able to fire a blaster, making T-3PO able to handle itself in a battle.