J . G . Hertzler John Garman " J . G . " Hertzler is an American actor from Savannah , Georgia , who has portrayed many different roles on several " Star Trek " series . He is one of only five actors to play seven or more different characters in the Star Trek franchise , the others being Jeffrey Combs , Randy Oglesby , Vaughn Armstrong and Thomas Kopache . Hertzler ' s best - known role is Martok , whom he played for four seasons on . He also wrote the continuation of his character ' s story in " The Left Hand of Destiny " novel diptych with Jeffrey Lang . In addition , Hertzler has provided voice - over roles on several " Star Trek " computer games , including " " and " " as the voice of Martok . Hertzler also played the role of Koval in the independent production " Star Trek : Of Gods and Men " . In 2007 , it was announced that Hertzler would play Harry Mudd in a forthcoming edition of " Star Trek : New Voyages " , which he would also direct . In a special feature on the DS9 7th Season DVD set ( disc 7 ) , Hertzler remarks , " " You know , the thing about " Star Trek " is they use more theater people , Shakespearean - trained ( I ' ve done a lot of Shakespeare – most of the Klingons have done a lot of Shakespeare ) and that ' s something that " Star Trek " was unique . Is unique . They tend to go with people who can operate in a strangely heightened reality and somehow make it as close to reality as you can . That ' s sci - fi , you know , that ' s what you need . " " Career . Hertzler made his film debut in the 1978 independent horror film " The Redeemer : Son of Satan ! " , which starred Jeanetta Arnette . He then appeared in the Academy Award - nominated film " . . . And Justice for All " , along with Keith Andes and Robert Symonds . In both the 1970s and the 1980s , however , he worked primarily on stage , including a stint on Broadway in an adaptation of the Greek tragedy " The Bacchae " . One of Hertzler ' s first major television roles was a guest spot in the " Quantum Leap " episode " Sea Bride - June 3 , 1954 " , where he appeared with Scott Bakula and Dean Stockwell . Hertzler then became a regular on the 1990s series " Zorro " , playing Alcalde Ignacio de Soto during the show ' s third and fourth seasons . Duncan Regehr was the star of this series , and Henry Darrow was also a regular . Hertzler has since guest - starred on such shows as " The Adventures of Brisco Country , Jr . " ( in an episode directed by Kim Manners and co - starring Morgan Woodward and David Youse ) , " Diagnosis Murder " ( directed by Leo Penn ) , " Dr . Quinn , Medicine Woman " ( with Chad Allen , Leland Orser , and Gregory Sierra ) , " Seinfeld " ( starring Jason Alexander ) , and " Lois & Clark : The New Adventures of Superman " ( with K Callan and Teri Hatcher ) . In 2000 , Hertzler and Jeff Corey appeared as council members in an episode of " Charmed " . Hertzler also guest - starred on the science fiction series " Roswell " in an episode written by Ronald D . Moore ; William Sadler was a regular on this series . Later that year , Herzler worked with Lee Meriwether , Keith Szarabajka , and Ray Walston on an episode of " Touched by an Angel " . He had a recurring role as a gallery owner on the HBO series " Six Feet Under " , during which time he worked with Joanna Cassidy , James Cromwell , Ann Cusack , Matt Malloy , Chris Pine , Anne Ramsay , and Jeff Yagher . His other TV credits include the role of Black Dog in the 1994 family - oriented fantasy TV movie " Treasure Island : The Adventure Begins " , in which Anthony Zerbe portrayed Long John Silver and Shannon Cochran played the mother of the young protagonist . Hertzler also appeared in the 1996 mini - series " Innocent Victims " , along with Sam Anderson , Richard Fancy , Gregory Itzin , Don Keefer , Don McManus , Glenn Morshower , and Leon Russom . In 1999 , Hertzler played director in the biographical TV movie " Pirates of Silicon Valley " , which also featured Jeffrey Nordling and Marc Worden . Hertzler has appeared in few feature films since the 1970s . His first film credit since 1979 ' s " . . . And Justice for All . " was the 1998 direct - to - video horror thriller " The Prophecy II " , which also featured Elizabeth Dennehy and Tom Towles . In 2000 , Hertzler acted in a short film called " Jane " along with Gary Combs . He has since appeared in two films starring " Battlestar Galactica " s : 2005 ' s " The Great War of Magellan " ( which Hatch also wrote , produced , and directed ) and " InAlienable " . The former movie also starred Brad Dourif and Richard Lynch , while the latter project was written by Walter Koenig and featured fellow " Star Trek " alumni Erick Avari , Gary Graham , Richard Herd , Andrew Koenig , Judy Levitt , Lisa LoCicero , Courtney Peldon , Jeff Rector , Alan Ruck , and Marina Sirtis . In addition to his film and television work , Hertzler has supplied his voice to a number of video games , in addition to the " Star Trek " games mentioned above . He and his DS9 co - star Armin Shimerman both had voice - over roles in the 2007 computer game " BioShock " . More recently , Hertzler voiced Captain Benjamin Mathius in the computer game " Dead Space " , which also featured the voices of Scott MacDonald , Peter Mensah , Andy Milder , and the aforementioned Keith Szarabajka . In November 2013 , Hertzler , a Democrat was elected to the town board of Ulysses , New York , a suburb of Ithaca , twenty minutes south of a town called Romulus . He has been residing in Trumansburg , NY , and worked for a time as a theater and film department adjunct professor at Cornell University . On June 8 , 2017 , Hertzler announced his candidacy as a US House Representative for New York ' s 23rd congressional district in the 2018 elections . As part of his campaign appearances , he plans to act " in the persona of Mark Twain " to present his ideas " through the brilliant humorist for all ages . " He stated that this was a tribute both to Twain , who resided once in Elmira , and to actor Hal Holbrook , who had portrayed Twain on stage for more than six decades . Hertzler joined several fellow " Trek " alumni advocating against the administration of Donald Trump , including Whoopi Goldberg , Seth MacFarlane , Zachary Quinto , Patrick Stewart , and George Takei .