Martok, son of Urthog is a recurring character in Star Trek: Deep Space Nine, played by actor J. G. Hertzler. Martok is a high-ranking Klingon leader at the Federation-Bajoran space station in the late 2300s. Martok figures prominently in many of the show's long running story arcs, and also is an important relationship for Worf. Source: Wikipedia (en)