The Khund are an offshoot of the Kree line who were re-conquered by the Kree after they discovered the Galactic technology that gave them their initial spurt of power. They are now a client race who are concentrated in the same space sector as Earth and are commonly used as shock troops by the Kree. They are a semi-autonomous satrapy and often start their own initiatives to aggrandize power on their own.
Khund are generally stronger and tougher than humans, though less liable to mutation. Mutated Khunds have been known, however.