A unit of young Vori soldiers that takes in Chakotay after his shuttle crashes and draws him into its war against the Kradin, an experience that proves to be manufactured.
The Fourth Vori Defence Contingent is a squad of foot soldiers fighting in the jungle of a Delta Quadrant planet against an enemy they call the nemesis. Its members speak a distinctive idiom of their own and regard the Kradin as beasts who desecrate the dead.
In the episode Nemesis, Chakotay falls in with the contingent after being shot down. He trains beside recruits such as Namon and Rafin under their leader Brone, watches them die, and sees a village of friendly civilians carried off. By the end he is fighting the Kradin with real hatred.
Tuvok then finds him and shows that the whole experience was a Vori conditioning programme used to turn captives into soldiers. The Kradin, whose ambassador has been helping Voyager, describe the Vori in exactly the terms the Vori used of them.