The command bridge droid, which can also be referred to as simply the command droid, represented a specialized alteration of the TDA-series droid assistant line. This particular model of protocol droid was deployed as staff on the command bridge of the Colossus, a supertanker fuel depot. 4D-M1N, who served as Captain Imanuel Doza's contact, was a command bridge droid, and the command droids of the Colossus, which were more rudimentary, were under the authority of her.