The Sakaarans are a sentient insectoid race native to the planet Sakaar, which they share with a large number of stranded individuals of many different species. A client race of the Kree, Sakaaran soldiers were commonly placed within Kree military ranks.
The Sakaarans originate from Sakaar, a world formed by the Grandmaster, infamously known for being a place where individuals from across the galaxy find themselves stranded from their respective homeworlds and are forced to compete in the Contest of Champions.
Amongst those stranded there were two Avengers, Bruce Banner and Thor, who were forced to do battle in a gladiatorial match. During their subsequent escape, they incited a massive uprising against the Grandmaster. One Sakaaran, Miek, aided the two.
The Sakaarans are a close associate race to the Kree, and could often be found integrated into Kree society, such as the military. Korath the Pursuer, a close ally of Ronan the Accuser, was known to command a large platoon of Sakaaran mercenaries. When Ronan was ordered by Thanos to find the Orb, Korath and his Sakaarans joined Ronan in his hunt.
Korath and two Sakaarans found the Orb on Morag, just as Star-Lord had obtained it within the Temple Vault. They gave chase as Star-Lord activated his helmet to escape.
The Sakaarans would continue to aid Ronan and Korath until the end, which came during the Battle of Xandar, where all of Korath's Sakaaran allies were killed in the battle.