CS-321 was an RA-7 Protocol Droid that was owned by Weequay pirates. It was destroyed when it was melted down in a Separatist incinerator room. CS-321 appeared to be tan in color and bore several brown designs.
- "Soon it will be us."
- ―CS-321 to C-3PO about fighting K0-5D in a gladiatorial arena
Soon after, the pirate frigate was destroyed by General Grievous causing all of the droids to be pulled into space. Like 3PO and R2, CS-321 landed in General Griveous' ship and was taken to the incinerator room to be melted down and used as a building parts. Afriaid of being incinerated, the droid attempted to escape, however he was shot by several B1 Battle Droids and was destroyed in the furnace.
- Nomad Droids (First appearance)