R3-S6

"Master, they just delivered your replacement astromech droid. This is R3-S6. I've heard that the new R3s are far faster in thinking skills and more powerful than the old R2 units."

- Ahsoka Tano introduces R3-S6 to Anakin Skywalker

R3-S6, also known as Goldie, was a replacement astromech droid assigned to Anakin Skywalker during the Clone Wars after the loss of R2-D2. Serving as a double-agent for the Separatists, R3-S6 would often sabotage Republic missions.