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The Klingons are a major race in the Star Trek universe. The primary antagonists in The Original Series, the Klingon Empire and the Federation form an alliance before the time of The Next Generation. Several Klingon characters appear across the Star Trek franchise and a constructed language for the race is the most popular fictional language by number of speakers, according to Guinness World Records. Use this tag with the [star-trek] tag.

The Klingons are a fictional warrior race in the universe. They maintain a sizeable empire that reaches into both the Alpha and the Beta quadrants of the Milky Way Galaxy.

Klingons are recurring villains in the original 1960s television series , and have appeared in all five spin-off series and in eight feature films. Initially intended to be antagonists for the crew of the USS Enterprise, the Klingons ended up a close ally of humanity and the United Federation of Planets in and . In the 1990s series , the Federation briefly goes to war with the Klingons, as a precursor to the . They eventually form an Alpha Quadrant alliance with the s in order to fight off the Dominion.

As originally developed by screenwriter Gene L. Coon, Klingons were swarthy humanoids with little honour, intended as an allegory to the Cold War tensions between the United States and the Soviet Union, though Star Trek creator Gene Roddenberry did not aspire to any political parallels. With a greatly expanded budget for makeup and effects, the Klingons were completely redesigned in Star Trek: The Motion Picture (1979), gaining ridged foreheads that created a continuity error not explained by Star Trek canon until 2005. The first appearances of the now standard Klingon character traits relating to honor and willingness to die in battle can be found in Christopher Lloyd's portrayal of Kruge in Star Trek III: The Search for Spock. In later films and in the spin-off series Star Trek: The Next Generation, the Klingon sense of honor, the warrior code underlying their morality, and their power structure in terms of great family houses are all further developed.

Among the elements created for the revised Klingons was a complete language, , developed by Marc Okrand. Klingon has entered popular culture; the works of William Shakespeare and even parts of the Bible have been translated into the guttural language. A dictionary, a book of sayings, and a cultural guide to the language have been published. In addition, according to Guinness World Records, Klingon is the most popular fictional language by number of speakers.

(from Wikipedia)