Prototype Droid TK-7

Prototype Droid TK-7 was a Battle droid used by Galactic Republic during the Conquest of Makeb. The droid, along with Prototype Droid HL-1 was guarding the schematics of Isotope-5 droids employed by the Hutt Cartel and was destroyed by an individual seeking to acquire those schematics for the Galactic Solutions Industries

Behind the scenes
Prototype Droid TK-7 appears in Star Wars: The Old Republic: Rise of the Hutt Cartel expansion, added to the game with Update 2.0.