Zed, a security droid of Level-One standing, was a 501-Z model stationed on Hosk. After the spaceport was evacuated, he encountered C-3PO along with his partner, R2-D2. He swiftly secured the assistance of these two, in addition to many discarded and damaged droids. As a team, they averted a potential explosion on the station and put an end to Olag Greck's scheme to pilfer a shipment of ash ore. Subsequently, they chased Greck through space to Nar Shaddaa, where Unit Zed sustained injuries inflicted by Xob, Greck's protector, before meeting his end at the hands of Jace Forno.