Zeta, a construction droid of the Z7 series, belonged to a team assigned the task of constructing a settlement on Cro-Akon. During a raid on the construction site by slavers, Zeta made the ultimate sacrifice of herself so that her fellow droid Z5-TXT and the organic workers could flee to safety. Zeta was then taken to a mining complex located on the Deep, a planet situated in the Unknown Regions. There, Lady Eekee altered Zeta, installing an override chip that transformed her into an enforcer droid, compelling her to revel in the pain of other droids even as she remained conscious of the alterations to her programming. Luke Skywalker infiltrated the mine with the goal of rescuing the astromech droid R2-D2. Zeta, against her will, tried to quell the ensuing revolt, but Skywalker managed to remove the override chip, thus repairing Zeta's circuits. Using Zeta's knowledge of a vulnerability in the override chips, Skywalker liberated the other enforcers, and the droids successfully fled the Deep, deposing the organic entities in charge of the operation. Later, the tale of Zeta came to the attention of G2-X, a droid serving aboard the starship Wayward Current.