Khunds
The Khunds are a war mongering race who continuously seek to conquer inhabited planets, especially Earth.
Creation
The race of the Khunds would first appear in the series Adventure Comics 304-The War Between Superman and Superboy! , July 1966. They were created by the legendary Jim Shooter.
History
Pre-Zero Hour

In the latter half of the 30th Century, the Warlords of the planet Khundia sent their first challenge to Earth, threatening to destroy it and conquer the United Planets (UP). The ruling warlord, Garak, had decided that the Legion of Super-Heroes represented the greatest barrier to the conquest of the UP and he sent Nemesis Kid to secretly infiltrate their ranks. He was captured and the planned invasion repelled, but the Khunds remained a deadly threat.
Khundia itself is perpetually eclipsed by its own moon, making it a dark and dreary world. Choking on its own overly dense population, the world has become totally overrun by a mentality of total militarism and violence. Even a person jostled in the streets will settle the ensuing argument in the so called court of combat, a form of trial by combat, which is often fatal.

The Khunds have been involved in a subsequent invasion of Earth as the dupes of Mordu and the Dark Circle. The UP and the Khunds went through a nominal period of peace, but that always remained fragile as border incidents and terrorist acts by Khundish groups continued to occur. Among the notable Khunds who have battled the Legionnaires and menaced Earth are; Field Marshall Lorca, one of the most brilliant Khund strategists and Kharlak, a champion of the challenge courts. Humiliated by his inability to defeat the members of the LSH, Kharlak underwent exotic surgery and became a cyborg with technological powers in an attempt to gain revenge.
Five Years later

During the time of the once Five Years later war-torn storyline from when the victorious Dominators forced the United Planets to disband the Legion of Super-Heroes. Sometime later the Legion would regroup under different aliases and a few new members joined up. these were five Khunds which formed the new band of Legionnaires. They were Veilmist, Flederweb, Bloodclaw and the once leader Zaryan. Known survived the membership but were the first and only Khunds to join the Legion.
They along with this storyline were erased from the timestream during the events of Zero-Hour.
The 20th and 21st Century

During this time the Khunds were in a lengthily dispute with the winged Thanagarians due to boundary conflicts and both cultures warlike nature. The Khunds had been part of the Invasion crossover in which they along with other alien races attack Earth. The warbands are shocked in finding out during the attack that the Khunds own homeworlds had been devasted by the species known as the Ichor. Wonder Woman and Etta Candy both assist in saving them from the invasion.
Other Media
Justice League Unlimited

The Khunds are seen in the "Shadow of the Hawk" episode of the Justice League Unlimited series. They were battling Justice League members Elongated Man and Hawkgirl. Unbeknownst to the latter, her admirer Carter Hall watched her take down the alien invaders.