Klingon

Klingons
Star Trek character
The Klingon insignia, designed by Matt Jefferies
First appearance	"Errand of Mercy" (1967)
Created by	Gene L. Coon

The Klingons (/ˈklɪŋ.ɒn/ KLING-on or /ˈklɪn.ɡɒn/ KLIN-gon;Klingon: tlhIngan [ˈt͡ɬɪ.ŋɑn]) are a fictional extraterrestrial humanoid warrior species in the science fiction franchise Star Trek.

Klingons are recurring antagonists in the 1960s television series Star Trek: The Original Series, and have appeared in all five spin-off series, along with eight of the feature films. Initially intended to be antagonists for the crew of the USS Enterprise, the Klingons became a close ally of humanity and the United Federation of Planets in Star Trek: The Next Generation. In the 1990s series Star Trek: Deep Space Nine, the United Federation of Planets briefly goes to war with the Klingons, due to manipulation by the Dominion. Later in that series, the two join together with the Romulans to fight the Dominion.