He and Gaib worked together as a kind of high tech bounty hunters. They had been hired by Mereel Skirata to find Ko Sai, who was trying to beat the Republic's cloning ban. He was similar in appearance to a R2-series astromech droid, except he was taller and better armored.
When Jabba the Hutt's son, Rotta, was kidnapped during the Clone Wars, the crime lord hired Gaib and TK-0 to find the location of his son. They successfully traced Rotta's location to Teth. Jabba was so impressed with the pair's work, he kept them on retainer.
- Republic Commando: True Colors (First appearance)
- Star Wars: The Clone Wars novel
- Imperial Commando: 501st