MSF-111 originated as an MSF mouse droid built on Uffel, which is a moon populated exclusively by droids. Around 31 BBY, the rogue droid LN-73 tried to disable the droid manufacturing plants on Uffel, but the Heroes of Cularin, a band of independent agents, stopped him. MSF-111 expressed his desire to accompany the agents when they departed Uffel, and the other droids residing there granted him their approval.