The Infected are humans and/or other lifeforms that have been mutated by the Blacklight Virus. During the first outbreak, some were born from Elizabeth Greene's will, such as the hunters, and could be found throughout New York City.
Most were either developed in Hives that were located throughout the city, or bred in infected water towers, which were also prevalent throughout Manhattan Island. During the second outbreak, some forms of the infected were the result of Alex Mercer's will and developed in underground Lairs.
Types of Infected
They are infected civilians whom still retain their humanity and mindset. Many of them are civilians whom unknowingly infected by Blacklight Virus, but still behave normally due to them yet to shown any symptoms. Though some Blackwatch or Military personnel can also became one of these, they yet to pose much threat until they finally succumbed to the virus.
See: Zombies (Prototype)
They are citizens (as well as Military and Blackwatch members) that infected by Blacklight virus during both first and second outbreak. There are 2 types of the zombies, the regular zombies and walkers, zombies whom modified within the hive with different strain and incubated until being released into the stronger, dangerous forms.
HuntersHunters are the main offensive force of the Infected, and are the most common infected variant that actually pose a real threat to Mercer. They are usually found near Hives and Water Towers, as these are their breeding grounds. All hunters are created in more sophisticated way than zombies.
The Hunters are presumed to have been human like zombies at one point, since they have a vaguely hominid appearance, however, they have been drastically altered by the virus. The most notable change is their size; they are at least twice as large as the average human being, and much stronger.
HydraHydras are large, worm/tentacle-like incarnations of the Blacklight virus. They possess a jagged, horizontal maw at their end that gives them a forked appearance. It's unknown whether they either created from humans or worms that infected by Blacklight virus, but whatever creature that they originally was at one point, the mutation eventually gives birth to these giant monsters.
A Hydra will emerge from the ground when it senses a threat, such as a tank or a helicopter. When the enemy moves outside of the Hydra's range, however, it will retreat underground once more, possibly to move to a more effective location. All Hydras are controlled by Elizabeth Greene, as when she dies, no more Hydras showed up.
In Prototype 2, one of the captured Hydras was consumed by Heller, resulting in the mutation where he gained Tendril power.
MotherAfter having near complete mastery over the redlight Virus and its mutations, Elizabeth Greene creates Mother, a gigantic monstrosity that she mentally controlled from the inside. Erupting from the ground to confront Mercer and the military, she appears as a repulsive mass of infected biological matter standing over 20 feet in height. The mass is supported by something resembling a spinal column, which is protected by three thick, tentacle-like growths.
Brawler HuntersMore powerful versions of hunters that created in the second outbreak. Brawlers can be distinguished by the growth of spikes on their backs.
The brawler hunters somewhat serves as wardogs for the Evolved forces via Pack Leader ability as some Evolved members are seen summoning and controlling the brawler hunters as their minion to fight Heller. After consuming Karen Archer, one of the Evolved whom controlling the brawler hunters, he can summon up to 4 brawler hunters as his own minions for battle.
JuggernautJuggernauts are the "Tanks" of the infected army created during the second outbreak. Most Juggernauts are found inside Infected Lairs located in NYZ and are occasionally accompanied by Brawlers. Juggernauts are powerful creatures, built with durable, obese bodies, thick and stubby legs, large fists, and jaws broken into three separate parts. They are capable of dealing tremendous damage to enemies and the environment around them while blocking projectiles directed towards them, thus truly earning the name "Juggernaut". Some Juggernauts have the ability to create groundspikes similar to Mercer's Claw Groundspike ability. These variants are called "Alpha Juggernauts". These Juggernauts are darker, have large growths on their backs and excrete a type of "gas" similar to the type that Heller excretes when he uses his Pack Leader ability. Alpha Juggernauts have more health and do more damage than their regular counterparts.
Heller briefly used two of these beast to find his daughter.
GoliathInfected behemoths that larger than juggernauts. They appeared to be vaguely humanoid, though larger than a building of several stories. They also appeared to lack skin on most of their body, displaying their bare musculature. Also, their face are also severely lacking in skin, which will give them an almost skeletal look. Noticeably, all four of their limbs are in different proportions. In spite of this, they move surprisingly fast, with oddly-angled back legs and front arms like a massive gorilla.
FlyersLocal birds which mutated into flying monsters and aerial forces of the infected forces. Flyers have pinkish flesh, scraggly feathers, have batlike wings under their falling feathers on both sides, and gnarled faces. Their wingspan is approximately two meters and they have enough sufficient bulk to knock a helicopter out of the sky. They resemble the appearance of vultures.