2-1B technical droid

The 2-1B technical droid was a variant of the 2-1B medical droid that specialized in repairing droids and replacing their parts. In The Glove of Darth Vader, a group of them replace R2-D2 and C-3PO's exterior plating with shells resembling common Kessel droids, allowing them to spy on the ceremony declaring Trioculus the heir to the Emperor's throne and ruler of the Empire.