N-3RO was a droid residing on the scrap planet called Zoh. On Zoh, he and other droids were under the direction of Jek-14. Not long after the Freemakers arrived on Zoh in search of Jek-14's assistance, N-3RO spearheaded a droid rebellion directed at Jek-14 and the Freemakers. N-3RO was able to persuade the other droids, including BL-OX and Fixer, that humans are inherently untrustworthy. Their efforts were unsuccessful, and N-3RO remained on Zoh, now equipped with a restraining bolt.
LEGO Star Wars: The Freemaker Adventures marked N-3RO's initial appearance, and he was subsequently canonized in Star Wars: Droidography. French Stewart provides the voice for N-3RO in LEGO Star Wars: The Freemaker Adventures.