FE-B3, frequently called Fee-Bee, functioned as a translator for the Haddrex Gang and was a protocol droid built for that purpose.
During their search for intelligence on the crime lord known as Xev Xrexus, Cad Bane and his crew discovered a freighter owned by the Haddrex Gang. Excluding FE-B3, their protocol droid, the bounty hunters killed every member aboard the ship. The Sith Lord Darth Maul and Troo-tril-tek, the Chadra-Fan bounty hunter, then tortured and questioned FE-B3. Ultimately, FE-B3 gave his attackers the coordinates for Xrexus' auction along with the necessary verification codes. FE-B3 was brought to the auction site in the Drazkel system, where his requests to be thrown into space were ignored. After Jee Kra and his people were killed, FE-B3 was taken by Maul and Bane's group. After fleeing Xev's hideout with Eldra Kaitis and then crash-landing on the moon of Drazkel, FE-B3 came across Maul and pleaded for assistance. Maul, however, used his lightsaber to obliterate him.