Klingon Empire

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. Later in that series, the two join together with the Romulans to fight the Dominion.