When the Klingon High Council suspected that Dominion agents were controlling the Cardassian government’s Detapa Council. Martok led the massive invasion on Cardassia from his flagship, Negh'Var. Martok's mission of eliminating the Detapa Council was thwarted when Starfleet officer Ben Sisko rescued the council, and Martok subsequently turned his attack onto station Deep Space 9. When Gowron decided to end the battle and return home, Martok argued that victory was close at hand, even though continuation of the fight would have greatly weakened the empire. Agents of the Dominion captured Martok while he was hunting sabre bear on Kang's Summit. A shape-shifting Founder replaced him, so no one suspected the substitution. Captain Benjamin Sisko and his men exposed the duplicate Martok as a Founder spy. The real Martok was held until 2373 by the Jem'Hadar at Dominion internment camp 371 in the Gamma Quadrant. Following his escape from Dominion imprisonment, Martok was assigned to command a detachment of Klingon warriors stationed at Deep Space 9. When war broken out with the Dominion General Martok was given control or the Klingon fleet. When Gowron decided to take control but started making bad mistakes Martok with Worf’s help. Martok became leader of the Klingon High Council.