The Zehoberei, or Zen-Whoberi are a green-skinned alien race. The Zehoberei are the inhabitants of the planet Zen-Whoberi. Due to overpopulation, poverty and starvation were a commonplace issue across the planet, so much that the planet became an early target of Thanos.
The Chitauri are a sentient species of cybernetically enhanced beings operating under a hive mind intelligence. Subservient to the overlord Thanos, they were most notable for being the first major threat to the Earth that required the formation of the Avengers when they attempted to commence a planetary invasion as part of an alliance between Thanos and Loki.
The Cosmic Entities are a group of primordial cosmic beings responsible for the creation of the Infinity Stones. They are mysterious and powerful beyond mortal comprehension, existing as myths to the oldest species in the universe.
The Celestials are an ancient race of entities that possess vast matter and energy manipulation abilities. They were present long before the dawn of the galactic communities and even the Asgardians. They were notorious for their utilisation of the Infinity Stones.
The Skrulls are a scientific, militaristic, and technologically advanced race of extraterrestrial reptilian humanoids that are capable of shapeshifting. The Skrulls are villains bent on invading Earth and are engaged in a prolonged war with the extraterrestrial Kree.
The Kree are a scientifically and technologically advanced militaristic race of blue-skinned humanoids from the planet Hala. One of the most technologically efficient races in the galaxy, the Kree have special emphasis placed on their skills in genetic engineering and are known to the people of Earth as the progenitors of the Inhumans.
The Eternals are a race of near-immortal beings genetically engineered by the Celestials. Millions of years ago when the cosmic beings known as the Celestials genetically experimented on humans, they created the super-powered individuals as well as more villainous off-shoots known as the Deviants.
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 Dark Elves are the oldest known species in existence, hailing from the obscure realm of Svartalfheim. They are mortal enemies of the Asgardians. Some members of their race have been shown to have the fortitude to wield the power of an Infinity Stone. They are now presumed to be critically endangered as a species or even extinct.
The Frost Giants are a race of humanoid giants that live on Jotunheim, one of the Nine Realms. They are ruled by Laufey, king of the Frost Giants, who is also Loki's true biological father.
The Outriders are a mindless species of aliens subservient to Thanos and the Black Order, used to fight in the Battle of Wakanda. The Outriders were deployed in Thanos and the Black Order's assault on Earth, specifically in their attempt to retrieve the Mind Stone from Wakanda.
Luphomoids are a blue and purple skinned humanoid race. Nebula is a member of this race. The warlord Thanos killed a family of Luphomoids, taking their daughter, Nebula, as his own and training her to be an assassin.
The Sovereign are a highly advanced, genetically engineered galactic race who live on the collective of planets of the same name. The Sovereign had their homeworld attacked by an Abilisk that was wreaking havoc on the world and trying to eat the planet's power source.
The Asgardians are the inhabitants of Asgard. They are a race of extraterrestrial beings similar to the human beings possessing a highly advanced form of technology resembling magic and sorcery, which their entire civilisation is built on.
The Titans are a race of beings from the planet Titan who were all but destroyed by a catastrophic event. The Titan Thanos was born on the planet Titan, and due to his severe deformities, was considered an anomaly by the Titan society and grew up as an outcast. Despite so, Thanos loved his people nonetheless.