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Everything we know about the humanoid species of Klingons has been gathered into this resource. Klingons are a fictional extraterrestrial humanoid warrior species in the Star Trek universe. Klingons are recurring antagonists in the Star Trek franchise. They are an aggressive, warlike, and honor-bound people, eager for combat and conquest. Klingons are one of the most popular alien species in the Star Trek universe, and have been featured in numerous television episodes, films, and video games.