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. Concept and production J. G. Hertzler made his first appearance in the franchise in the Star Trek: Deep Space Nine pilot episode, "Emissary", as a Vulcan Captain who is killed when his vessel is destroyed. Following this, he made his first appearance as a Klingon in the video game Star Trek: Klingon, directed by Jonathan Frakes and also starring Robert O'Reilly as Chancellor Gowron. When the producers of Deep Space Nine were casting Martok, Hertzler auditioned after initially not considering the role but found himself getting angry during the interview due to a comment from the director which he felt was insulting. However, this response led to him gaining the role, and it was included as a character trait for Martok. It took around three hours each day for the make-up to be applied to Hertzler by David Quashnick, who was the "specialist" who did both Hertzler and O'Reilly's Klingon make-up. Hertzler did not mind the process, but stated that having the prostheses block the sight in his left side could sometimes make filming difficult as he could not see when turning that way. He felt it was important to the character to remind him of the time spent on the Dominion prison world, and turned down the opportunity to have Martok's sight restored when it was suggested by executive producer Ira Steven Behr. In particular, Hertzler felt it gave the same air to Martok as Christopher Plummer's character in Star Trek VI: The Undiscovered Country. In 2020, Hertzler talked about developing the character: "As a stage actor you usually get some weeks to rehearse, if you get lucky, and then you go on. And with Martok, I was able to work on him for four years. Now I am still doing it 25 years later!" In an interview in 2021, with Heavy Hertzler, noted for playing Martok, discussed how it was working with the cast of Deep Space Nine. He found it was intimidating at first, because the regular cast had worked with each other for years, and the Martok character had to "boss