TR-350 is a minor antagonist in the Star Wars: The Clone Wars episode "Blue Shadow Virus". He was a T-series tactical droid who was part of Separatist scouting patrol on the planet Naboo that was attacked by members of the Royal Naboo Security Forces during the Clone Wars.
History
On Naboo, a TR-350 and two other Battle Droids were to carry out orders while Dr. Nuvo Vindi was planning to release the Blue Shadow Virus back into the galaxy. The speeder it rode on was destroyed, but the droid was captured. TR-350 served in a Separatist scouting patrol on the planet Naboo and was attacked by the Royal Security Forces.
The droid was captured and the top of its head including the eyes was removed and brought to the Theed Palace. In a droid repair room, the tactical droid was examined and Senator Amidala found it odd that it was found in the grasslands, but was covered with thick mud. TR-350 was temporarily reactivated and, at Padme's prompting, Threepio tried to fish out any information about the droid's assignment on Naboo, while making it believe it was aboard a Separatist vessel.
The tactical droid utter something about a virus, specifically about a leak of a small amount of virus from a secret laboratory ran by the scientist Dr. Nuvo Vinidi. TR-350 soon realized it was not aboard a vessel and was in enemy hands. Typho put the droid at blaster-point and said it would have to reveal information on the lab if it wished to survive.
Jar Jar Binks, who was trying to catch a slug-beetle, got his tongue stuck on an R2 unit dome and knocked over some shelves, which toppled over and crushed the droid. It was interrogated but Jar Jar Binks accidentally destroyed it. However, Padmé noticed the mud on the droid, recognizing it as mud from the Naboo swamp, which eventually led to the discovery of Vindi's laboratory.