The Chitauri are a race similar to Earth-616's Skrulls, as they are a shapeshifting alien species who have attempted to conquer the Earth, most notably during World War II and again in the early 21st century. The Chitauri claim to be part of "the immune system of the Universe", wiping out disorder and free will wherever they find it. They seem to prefer to act behind the scenes, mimicking and influencing the social and military methods of the species they are currently infiltrating. For example, they aided the Nazis in their attempt at world conquest by providing them with the technology to create a nuclear bomb carried by an intercontinental ballistic missile.
However, this attempt was thwarted by the super-soldier codenamed Captain America. Through the entire conflict of World War II, the Chitauri were being driven out of their operations in Africa and Europe. And even from their main Japanese training camps in Hiroshima and Nagasaki. Following the end of the war, the Chitauri withdrew to make new plans.
The next attempt at conquest was more subtle (at first), involving long-term methods of manipulation such as will-inhibiting drugs in many nations' water supplies, influencing the media, and R.F.I.D. (Radio-frequency identification) microchips to be implanted in schoolchildren, among other means. The Chitauri also infiltrated S.H.I.E.L.D., particularly the Psi-Division which could telepathically ferret out Chitauri agents. However, S.H.I.E.L.D. was able to detect some of the low-ranking "drone" staff of the aliens, disguised as common office workers, and wiped them out in an assault led by Black Widow and Hawkeye.
The Chitauri planted false information through the compromised Psi-Division that led S.H.I.E.L.D. and the Ultimates into a trap on a small Micronesian island; due to the combined efforts of Iron Man and Thor, the Ultimates, Nick Fury and a handful of SHIELD soldiers survived, but thousands of S.H.I.E.L.D. soldiers were killed and dozens of Helicarriers were destroyed.
The Chitauri then counterattacked by infiltrating the Triskelion and capturing The Wasp. The Chitauri leader, known only by his former Nazi identity as Herr Kleiser, took the Wasp to a hidden Chitauri base in Arizona. However, their location was given away when a fleet of damaged Chitauri starships suddenly entered Earth's atmosphere to hover above the formerly secret base, claiming that they were fleeing major defeats across the galaxy by their intergalactic enemies and that the remainder of their forces are forced to the "backwaters" of the Milky Way Galaxy, specifically Earth's solar system. Disregarding Herr Kleiser's long-term efforts, the Chitauri ordered him to destroy Earth and its solar system with a doomsday bomb as part of a scorched-earth policy and retreat to the "lower fourth-dimension". The Ultimates and all available S.H.I.E.L.D. and military forces immediately converged on the alien fleet.
Although Iron Man and Thor were able to damage the Chitauri ships, whom the latter as well in ridding the Chitauri bomb by teleporting it to the wastes of Nastrond, where its detonation caused only a small ripple in space-time, it was the Hulk who downed the majority of the fleet. At the same time, Captain America battled his old enemy Herr Kleiser, but was unable to defeat him alone. At Captain America's urging, the Hulk was able to beat, dismember, and devour Kleiser. It is presently presumed that the combination of the Chitauri's series of intergalactic defeats and the destruction of the Chitauri fleet on Earth spelled the complete and total defeat of the alien race.
During the Chitauri-Kree War, an entire Chitauri armada was fighting their enemies when they encountered Gah Lak Tus. When their ships were being heavily damaged by the entity, a rift in the fabric of reality brought a being from another universe, which called itself Galactus. Gah Lak Tus merged with the visitor, and created an even more powerful Galactus with need to feed.
The Chitauri are a distinct species from the Skrulls, unlike their Earth-1610 counterpart. They worked with Titus and like him are enemies of Nova Corps' Supernovas; more specifically members Sam Alexander and his father, Jesse Alexander. Sam was able to defeat an entire Chitauri armada and Titus with the Ultimate Nullifier that he stole from them in the first place. They are currently holding Jesse as an hostage on a planet similar to Saturn.
In the Ultimate Avengers Universe, much like their Earth-1610 counterpart, the Chitauri are led by Herr Kleiser and plotted to invade Earth since the 1940s. The Chitauri helped Nazi Germany by providing an intercontinental missile in the last days of World War II in Europe. However, the plot was foiled by Captain America. Seventy years later, the Chitauri reappeared and forcing S.H.I.E.L.D. to implement Project Avengers. The Chitauri made an all-out assault on S.H.I.E.L.D. and the Avengers, whom they succeeded in defeating the aliens.
Chitauri later focus their attentions on the African country of Wakanda in seeking its store of vibranium, the metal the Chitauri use to manufacture their ships and weapons. Led again by Herr Kleiser, the Chitauri made a massive invasion of Earth from their mothership hovering over Wakanda. During the planetary battle, Bruce Banner discovered that the Chitauri's vibranium-made technology can be weakened by gamma rays and crucially provided this valuable information to the Avengers, in which Giant Man and Iron Man use a gamma-ray projector in destroying the Chitauri's mothership and stopping the invasion. Herr Kleiser is defeated by Captain America and Black Panther by drowning him in liquid vibranium.
This version of the Chitauri are reptilian creatures capable of shape-shifting and firing energy blasts from their hands.
Earth-199999 (Marvel Cinematic Universe)
In the Marvel Cinematic Universe, the Chitauri are an alien race led by Thanos. After he was cast out of Asgard, Loki approached the Other offering a deal: he would retrieve the Tesseract from S.H.I.E.L.D. for Thanos, and in return would receive an army of Chitauri which he could use to conquer Earth. Using a mind-controlled Dr. Selvig, Loki opened a portal between the Chitauri's realm and Earth over New York City.
After a destructive battle with the Avengers, the Chitauri were defeated when Iron Man sent a nuclear weapon through the portal, destroying the Chitauri's base and cutting the neural link. The remaining Chitauri in New York collapsed from the destroyed neural link. When the Other reported the Chitauri's defeat to his master, Thanos only grinned with anticipation of things to come.
This version are lead by Korvac. When Korvac sets out to destroy the Earth, the Guardians of the Galaxy attempt to stop him, but are captured. Rocket Raccoon, the only Guardian to escape, heads to Earth to get help from Nova. With help from Nova and a stowaway Spider-Man, Rocket Raccoon is able to free the captive Guardians, and stop Korvac's plan, destroying the Chitauri ship in the process. It is unknown what the Chitauri's presence is in the galaxy with their ship destroyed.
Powers and Abilities
Average Strength level
Habitat: Habitat of this race is unknown.
Gravity: Gravity of this race is unknown.
Atmosphere: Atmosphere of this race is unknown.
Population: Population of this race is unknown.
Type of Government: New World Order
Level of Technology: The Chitauri had access to advanced technology including a bomb powerful enough to destroy Earth's solar system and starships capable of faster-than-light travel
Cultural Traits: Cultural traits unknown.
- The name "Chitauri" probably originates from the name of the binary star Chi Tauri.
- On Earth-20604, Skrulls have noted that the term "Chitauri" as it relates to their race, is a "very offensive term". Skrulls regard the word as "politically incorrect". 
- The Earth-1610 counterpart to the Chitauri race may be an offshoot, cult or separate civilization from Earth-1610's Skrulls, since a separate "Skrull" race later visited Earth, who recognized the name but disclaimed any common motives between them.
- The design for Earth-199999's Chiatauri (later used as the definitive design for the Chitauri across the multiverse, minus Earth-3488's) were created by Phil Saunders and Justin Sweet, Ryan Meinerding developed the final look.
- The original appearance of a Chitauri in Earth-1610 was originally never shown. Years later in the mini-series Hunger, their original appearances was drawn to be similar to their Earth-19999 counterpart's.
- No trivia.
Links and References