A Ramuran tracer who secretly boards Voyager in 2374 to recover the runaway Kellin and erases her memories of Chakotay and of the ship.
Curneth is a tracer, one of the agents the Ramurans send to bring back anyone who tries to leave their closed society. He appears in the fourth-season Voyager episode Unforgettable.
The Ramurans cannot be retained in the memories of other species, and they guard that isolation fiercely. When the former tracer Kellin defects to Voyager out of love for Chakotay, Curneth follows her, hides aboard using Ramuran cloaking technology and fires a neurolytic emitter at her that slowly wipes away everything she has experienced since leaving home.
Kellin loses all feeling for Chakotay and agrees to go back. Curneth also plants a virus that purges every trace of the Ramurans from Voyager's computer, leaving only the account Chakotay writes by hand.