Commander Worf, who has appeared in numerous Star Trek projects, is undoubtedly the most popular Klingon in the franchise. However, if there were to be one in a close second, that honor would go to General Martok (J.G. Hertzler) from Deep Space Nine. He briefly appeared in two episodes of the series, only to return as a recurring character and a significant part of the ongoing story. Without Martok, Chancellor Gowron would still be leading the Klingon Empire, and Worf wouldn't be a part of the House of Martok.