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In a parallel universe, the Klingons were a species from the planet Qo'noS who were the leaders of the Klingon Empire. During the 24th century, they were allied with the United Federation of Planets. One Klingon, Worf, was a Starfleet officer who served on the USS Enterprise. (COMIC: Assimilation²)
Biology
The Klingons were humanoids with ridged foreheads.
Behind the scenes
The Klingons are one of the major races of the Star Trek universe. They have appeared many times in all six television series and all but two of the films.