Onnak was a Klingon who served aboard the IKS M'Char. In 2372, Kaybok ordered Onnak to board the SS Xhosa and search for Changelings, although Kaybok had also instructed him to plant an explosive in the engine room to destroy it. Onnak and eleven other Klingons in a boarding party attempted to transport onto the Xhosa, but were transported into space when the Xhosa went to emergency warp. Onnak died due to the exposure to space. (DS9 novelization: The Way of the Warrior)