Chitauri Footsoldier's History
The Chitauri are a sentient species of cybernetically enhanced beings operating under a hive mind intelligence.
Subservient to Thanos, they were most notable for being the first major threat to 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 Chitauri were Thanos' infantry during his attack against Zen-Whoberi, where he massacred half of the Zehoberei species in order to prevent overpopulation from condemning the planet. However, he chose Gamora, a little Zen-Whoberi girl, to be one of his adoptive daughters whereas he gave his adoptive son Ebony Maw the call to allow the Chitauri to wipe out half of the population.
When the exiled Loki allied himself with Thanos, the Chitauri were granted to him as his personal army to conquer Earth and gain the Tesseract.
Once having gained the Tesseract from S.H.I.E.L.D., Loki was able to open a portal to Earth and allow the Chitauri to arrive, thanks to the help of a brainwashed Erik Selvig. The Chitauri immediately started to wreak havoc on New York City, destroying buildings and gunning down civilians in the streets. The National Guard could not deploy enough troops quickly enough to counter the invasion. Luckily, the Avengers arrived, having fought Loki repeatedly in an attempt to hinder his efforts at summoning the army. Soon after their arrival, a major battle ensued between them and the Chitauri.
Not expecting such resistance, the Chitauri were initially overwhelmed, but soon their numbers increased so much that the superheroes found some difficulties in containing them. Captain America took command of the Avengers as well as the police forces, and thanks to his command, the Avengers' powers were properly used while they fought the menace. Eventually, the World Security Council attempted to destroy Manhattan with a nuclear bomb in order to contain the Chitauri invasion, but Iron Man intercepted the bomb and disposed of it into the portal, where it impacted and obliterated the Chitauri Command Center, instantaneously disabling all their forces and ending the invasion.
After their defeat, pieces of Chitauri technology were recovered by S.H.I.E.L.D., HYDRA, Hammer Industries engineers, and Adrian Toomes' Crew.
When Thanos rendezvoused with Gamora and Nebula in a Q-Ship following their massacre on Korbin, a Chitauri handed him a cloth to wipe the blood off his Double-Edged Sword.
A Chitauri was one of the specimens being held in Taneleer Tivan's museum before its explosion.
Many years later, Thanos ordered a Chitauri to guard Nebula, and tasked it with reassembling her cybernetics. It was killed when Nebula tricked it by faking a malfunction and taking it by surprise.
After the Avengers created an alternate timeline in 2014 in their quest to steal the Orb and the Soul Stone, the 2014 version of Thanos used reverse-engineered Pym Particles and a Quantum Tunnel to transport himself, his weaponry and his allies to 2023, including the Chitauri. Thanos' entire army was summoned to the ruins of the Avengers facility by Thanos after battling some of the Avengers.
However, when Thanos seemingly was going to win again, all of Thanos' victims came back to life and the ultimate battle for the fate of the universe took place. Alongside their fellow alien soldiers, many Chitauri warriors ended up losing their lives against the Avengers' forces. However, the battle came to an end when Thanos attempted once more to use the Nano Gauntlet, only for Iron Man to use the Infinity Stones, causing Thanos' army, including the surviving Chitauri, to fade away into nothingness before Thanos himself turned to dust.
