D435 functioned as a G1 series equipment operator droid, serving the Tredway family within the mining operations of the Sil'Lume asteroid belt. This droid heroically rescued Dena Tredway in the aftermath of the destruction of the asteroid base by the Imperial Governor Sebastian Parnell. Once Dena had been handed over to Luke Skywalker for conveyance to Ire Eleazari's asteroid, D435 chose to deactivate, thereby preventing its capture by Imperial forces.