TJ-55/Legends

This tactical droid was involved in the early stages of the Battle of Christophsis. His head was stolen for a robolobotomy for an investigation of stolen intelligence, but revealed nothing. However, a traitor was eventually revealed in the form of Clone Sergeant Slick, who was later apprehended.

History
"The Republic is in the north and south towers, level 58."

- Tactical droid, during a robolobotomy

After Separatist forces overwhelmed Christophsis, the Jedi High Council dispatched General Obi-Wan Kenobi and General Anakin Skywalker to defend the planet. While the Jedi planned an ambush from two towers in the Crystal City, the tactical droid ordered the droid army from an Armored Assault Tank. However, the droids revealed that they had a spy in the Republic forces that had informed them of the Republic's plans, arriving in the towers and ambushing the forces. The Jedi and clones were forced to retreat, and Skywalker signaled a gunship for an evacuation. However, as the Republic forces took an elevator to the roof, the blaster-wielding tactical droid followed them with B1 battle droids. Shortly before their escape, a clone trooper tore off the tactical droid's head and brought it with him, seeking to gain knowledge about how the Separatists knew of the Republic's plans. However, during a robolobotomy, the tactical droid did nothing but confirm that the Separatists had the Republic's intelligence before shutting down.

After some investigation by Clone Commander Cody and Clone Captain Rex, the traitor was discovered to be Sergeant Slick, and he was apprehended. After a duel with Asajj Ventress, Skywalker and Kenobi discovered the full strength of the Separatists forces, as they had planned a full-scale invasion and conquest of the planet. Under the command of General Whorm Loathsom, the Separatist forces were later defeated.