Klingon

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 in the 2360s. (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.
 * In the Top Gear "Master of the Universe" segment, a Klingon raced around the Top Gear track against a Dalek, a Cyberman and Colin Baker as the Sixth Doctor (as well as Darth Vader from Star Wars and Ming the Merciless from Flash Gordon).