CHITAURI (THE AVENGERS)
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 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 are a powerful, reptilian warrior race, a hybrid between organic beings and machines. They have a caste-like society, with each caste (nearly a different species in itself) fulfilling a different role in Chitauri society. They are controlled by a Mother Ship which never shows on the battlefield, and act as one during war. They have superhuman physical attributes, superior strategy, energy-based rifles and flying vehicles, but their main strength is in their great numbers.
Despite the Chitauri’s cybernetic augmentations, they are not seen to have any superhuman abilities such as enhanced strength, speed, or reflexes. They are seen to be agile and strong enough to climb on buildings and Leviathans with relative ease, but they were not quick nor strong enough to avoid or stand against Asgardians nor skilled Humans. They presumably have superior communication with each other via their Hive Mind, and thus are apt at strategy and coordination. Despite their interconnectedness, they are seen to be able to act independently, intelligent enough to engage in combat, assess various situations, and assist each other.
A form of ailment that plagues their race was inadvertently discovered by firefighters and apprehended by S.H.I.E.L.D. via a Chitauri Helmet salvaged from the Incident. Due to their half biological and half cybernetic bodies, this “virus” has both biological and cybernetic properties. It interacts with biological tissue, such as affecting nervous tissue and lying dormant in epithelial tissue, but it is transmitted by electrical shocks, such as the static of rubbing against an infected item. In humans, it causes a gradual buildup of electrostatic energy in the brain, eventually releasing a burst of 2,000 megajoules. This massive amount of energy leaves a burn mark on the forehead and just before erupting causes nearby metallic objects to float, caught in the resulting electric field. Additionally, the virus alters the host’s molecular density and polarity, resulting in the affected bodies found dead floating in the air.