CZ-4 came under the ownership of Jabba the Hutt, and was modified to work as a watchdog, warning his master of any sign of threat from within or without the palace walls. The stress of his job regularly left CZ-4 feeling strained, and at times when not needed by Jabba he would temporarily switch himself off. When C-3PO and R2-D2 were brought before Jabba's supervisor droid EV-9D9 inside the palace's droid workshop, CZ-4 was resting against a wall. As C-3PO was ushered out by a Gamorrean guard, he suddenly came face to face with the motionless, skeletal-looking CZ-4, and let out a startled wail. Later, when Luke Skywalker made his appearance before Jabba requesting that Han Solo be released, CZ-4 was back up in the palace throne room.