3B3-20 was an B1 battle droid that worked along side 3B3-21 during the Invasion of Naboo. He was tasked with protecting the Theed Palace with several other Battle Droids before he was shut down following the destruction of the Trade Federation Droid Control Ship. His droid body would later be taken by a Naboo Security Officer to show the Queen, Padme Amidala, that the battle with the Trade Federation was over.

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