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C-3PO (See-Threepio) was a 3PO-series protocol droid designed to interact with organics, programmed primarily for etiquette and protocol. Sometimes referred to as Threepio, he was fluent in over six million forms of communication, and developed a fussy and worry-prone personality throughout his many decades of operation.

On Geonosis in 22 BBY, C-3PO's head was separated from his body inside a droid factry and grafted onto the chassis of a B1-series battle droid. Meanwhile, a B1 battle droid head was inserted onto Threepio's body. During the First Battle of Geonosis, both of C-3PO's "bodies" were knocked out during the fighting. Fortunately for him, he was promptly reattached to his rightful body by R2-D2.

C-3PO Battle Droids[]