A Klingon Borg drone who was a leader of the resistance that formed among the visitors to Unimatrix Zero.
Korok is a Klingon who was assimilated by the Borg, and one of the drones who carry the rare trait that lets them visit Unimatrix Zero, a shared dream realm, while they regenerate. In Unimatrix Zero, he and Axum lead the effort to protect the realm, which the Borg Queen is hunting down and destroying.
Voyager's crew helps the resistance by giving these drones the ability to remember their individuality when awake. In Unimatrix Zero, Part II, Korok gains control of a Borg cube with other awakened drones, part of a resistance that survives after Unimatrix Zero itself is lost.