Greybok was a Wookiee male tribal diplomat who was enslaved and forced to mine spice on the planet Sevarcos in a mine controlled by the Galactic Empire. He and his fellow slaves the Weequay Hatchet and the Quarren Palabar freed themselves during the Battle of Sevarcos. Later, Greybok and his friends took part in the liberation of the Wookiee homeworld of Kashyyyk.