The Brunali homeworld was an agrarian Delta Quadrant planet repeatedly raided by the Borg, the birthplace of Icheb, whose parents had bred him to carry a pathogen into the Collective.
The planet is seen in the sixth-season episode Child's Play. The Brunali were once an advanced spacefaring people, but a transwarp conduit opens nearby, and the Borg strike whenever they detect technology. The survivors farm and rely on genetic engineering to grow food in ruined soil.
Voyager traces Icheb's parents, Leucon and Yifay, and brings him home. Seven of Nine, who has grown attached to the boy, distrusts their account of how he was taken, but Icheb chooses to stay.
She then learns the truth: he was engineered as a weapon and deliberately sent out to be assimilated, the origin of the infection that killed his cube. His parents drug him and launch him towards the conduit again. Voyager retrieves him from a sphere.