In "Star Trek", Klingons are aliens.

The statement "In Star Trek, Klingons are aliens" is true. In the Star Trek universe, specifically in the original series and its subsequent spin-offs, Klingons are portrayed as a distinct species originating from the planet Qo'noS (pronounced Kronos or Klingon homeworld). They are a warrior civilization known for their distinctive appearance, including their forehead ridges, and their aggressive nature. Throughout the various Star Trek series and movies, the Klingons are depicted as an alien race with their own language, culture, and societal structure, making them an integral part of the alien species encountered in the Star Trek universe.