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{{Quote|One single Flood spore can destroy a species.|[[Rtas 'Vadum]]{{Ref/Reuse|Floodgate}}}}
{{Quote|One single Flood spore can destroy a species.|[[Rtas 'Vadum]]{{Ref/Reuse|Floodgate}}}}


The '''Flood''', designated as '''[[LF.Xx.3273 Flood Super Cell|LF.Xx.3273]]''' by the [[Forerunner]]s ([[Latin]] '''''Inferi redivivus'''''<ref name="bestiarum">''[[Bestiarum]]''</ref> meaning "the dead reincarnated"<ref>[http://carnage.bungie.org/haloforum/halo.forum.pl?read=865888 ''Halo.Bungie.Org'': Updated and abbreviated list, errors amended]</ref>) and referred to as ''' the Parasite'''{{Ref/Level|H2|[[The Heretic]]|Quote=Thel 'Vadamee: ''"Noble Hierarchs, surely you understand that once the parasite attacked-"''}} and '''the infection'''{{Ref/Level|HW|[[Relic Approach]]|Quote=[[Re'gish Wamik]]: ''"What if the infection defiles the [[Relic (location)|relic]]?"''}} by the [[Covenant]], is a species of highly virulent parasitic organisms that reproduce and grow by consuming [[sentience|sentient]] lifeforms of sufficient biomass and cognitive capability. The Flood was responsible for consuming most of the sentient lifeforms in the galaxy - including the vast majority of [[Forerunner]]s - during the [[Forerunner-Flood war]] in ancient past, prompting the [[Great Purification|activation]] of the galaxy-sterilizing [[Halo Array]] in [[97,445 BCE]].{{Ref/Level|CE|[[Two Betrayals]]}}
The '''Flood''', designated as '''[[LF.Xx.3273 Flood Super Cell|LF.Xx.3273]]''' by the [[Forerunner]]s ([[Latin]] '''''Inferi redivivus'''''<ref name="bestiarum">''[[Bestiarum]]''</ref> meaning "the dead reincarnated"<ref>[http://carnage.bungie.org/haloforum/halo.forum.pl?read=865888 ''Halo.Bungie.Org'': Updated and abbreviated list, errors amended]</ref>) and referred to as '''the Parasite'''{{Ref/Level|H2|[[The Heretic]]|Quote=Thel 'Vadamee: ''"Noble Hierarchs, surely you understand that once the parasite attacked-"''}} and '''the infection'''{{Ref/Level|HW|[[Relic Approach]]|Quote=[[Re'gish Wamik]]: ''"What if the infection defiles the [[Relic (location)|relic]]?"''}} by the [[Covenant]], is a species of highly virulent parasitic organisms that reproduce and grow by consuming [[sentience|sentient]] lifeforms of sufficient biomass and cognitive capability. The Flood was responsible for consuming most of the sentient lifeforms in the galaxy - including the vast majority of [[Forerunner]]s - during the [[Forerunner-Flood war]] in ancient past, prompting the [[Great Purification|activation]] of the galaxy-sterilizing [[Halo Array]] in [[97,445 BCE]].{{Ref/Level|CE|[[Two Betrayals]]}}


Originating as a corrupted form of the galaxy's most ancient custodians (the [[Precursors]]){{Ref/Novel|Id=precursors|Sil|Page=173-175}} the Flood reproduces and spreads by infecting other organisms, hijacking their bodies and nervous systems in order to transform them into one of many specialized forms. Through infecting sentient lifeforms, the Flood assimilates their memories and intelligence, and the species becomes collectively more intelligent as a result. Because of their frighteningly rapid growth rate, as long as enough hosts of sufficient biomass and intelligence are available, the Flood is effectively unstoppable.  
Originating as a corrupted form of the galaxy's most ancient custodians (the [[Precursors]]){{Ref/Novel|Id=precursors|Sil|Page=173-175}} the Flood reproduces and spreads by infecting other organisms, hijacking their bodies and nervous systems in order to transform them into one of many specialized forms. Through infecting sentient lifeforms, the Flood assimilates their memories and intelligence, and the species becomes collectively more intelligent as a result. Because of their frighteningly rapid growth rate, as long as enough hosts of sufficient biomass and intelligence are available, the Flood is effectively unstoppable.  
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===First outbreak===
===First outbreak===
====Antecedents====
====Antecedents====
The Flood, as it is known in modern times, first appeared in the galaxy some time prior to [[107,445 BCE]], after [[Ancient humanity|ancient humans]] came into contact with the Precursor dust. This fine, desiccated powder had been stored in millions of glass cylinders placed aboard automated starships,{{Ref/Novel|Id=origin|Cry|Page=268-270}} bound toward the margins of the Milky Way galaxy from the direction of the [[Path Kethona|Large Magellanic Cloud]].{{Ref/Novel|Id=sil35|Sil|Page=35}} [[Forthencho]] came to believe that the [[Primordial]], despite its hibernating state at the time, may have been responsible for remotely triggering the movement of these ships.{{Ref/Novel|Pri|Page=226}} However, over ten million years, the substance had slowly deteriorated, along with the ships themselves failing.{{Ref/Reuse|origin}}
The Flood, as it is known in modern times, first appeared in the galaxy some time prior to [[107,445 BCE]], after [[Ancient humanity|ancient humans]] came into contact with the Precursor dust. This fine, desiccated powder had been stored in millions of glass cylinders placed aboard automated starships,{{Ref/Novel|Id=origin|Cry|Page=268-270}} bound toward the margins of the Milky Way galaxy from the direction of the [[Path Kethona|Large Magellanic Cloud]].{{Ref/Novel|Id=sil35|Sil|Page=35}} [[Forthencho]] came to believe that the [[Primordial]], despite its hibernating state at the time, may have been responsible for remotely triggering the movement of these ships.{{Ref/Novel|Pri|Page=226}} However, over a span of ten million years, the substance had slowly deteriorated, along with the ships themselves failing.{{Ref/Reuse|origin}}


The crashed remains of these ships were discovered by ancient humans on both inhabited and deserted worlds near the border of [[intergalactic space]], a region of the galaxy to which humans expanded early on in their history. Inside the ships, humanity found the capsules filled with powder, which their tests told them consisted of inert, short-chain organic molecules of unknown purpose.{{Ref/Reuse|origin}} Humanity studied the material and deemed it to be harmless but noted that it had psychotropic effects on lower animals. Small dosages were [[Drugs|administered]] to [[Pheru]], popular domestic animals among humans and San'Shyuum, which resulted in more docile behavior.{{Ref/Novel|Id=cryptum131|Cry|Page=131}} Unbeknownst to the humans or San'Shyuum at the time, the powder was altering the genetic code of the Pheru, manifesting as improved behavior while slowly changing other aspects of their genome.{{Ref/Reuse|origin}}
The crashed remains of these ships were discovered by ancient humans on both inhabited and deserted worlds near the border of [[intergalactic space]], a region of the galaxy to which humans expanded early on in their history. Inside the ships, humanity found the capsules filled with powder, which their tests told them consisted of inert, short-chain organic molecules of unknown purpose.{{Ref/Reuse|origin}} Humanity studied the material and deemed it to be harmless, but noted that it had psychotropic effects on lower animals. Small dosages were [[Drugs|administered]] to [[Pheru]], popular domestic animals among humans and San'Shyuum, which resulted in more docile behavior.{{Ref/Novel|Id=cryptum131|Cry|Page=131}} Unbeknownst to the humans or San'Shyuum at the time, the powder was altering the genetic code of the Pheru, manifesting as improved behavior while slowly changing other aspects of their genome.{{Ref/Reuse|origin}}


====Emergence====
====Emergence====
After the humans had exposed the Pheru to the powder for several centuries, disturbing changes appeared. Pheru treated with the powder began exhibiting furry growths and fleshy protrusions, which other Pheru were compelled to consume. Shortly afterward, the Pheru began suffering widespread abortions and genetic deformities, and many were euthanized or released into the wild. Soon afterward, the humans and San'Shyuum who had been in the presence of the altered Pheru began to exhibit some symptoms of the powder-induced "disease". Affected on a psychological level by the strange illness, infected victims began to consume the sick Pheru, and anything they touched became infected while parts of themselves that were discarded, such as tissue and limbs, also became vectors for the disease. The afflicted then moved on to cannibalism and sacrifice of the infected, inducing a sacrificial individual to grow to a prodigious size and then forcing uninfected individuals to consume them while they were still alive. During this time, the infection passed from human to San'Shyuum and human to human, but rarely San'Shyuum to human. The infected humans and San'Shyuum proceeded to spread the disease into other systems, which furthered the scope of the Flood outbreak.{{Ref/Reuse|origin}}
After the humans had exposed the Pheru to the powder for several centuries, more disturbing changes appeared. Pheru treated with the powder began exhibiting furry growths and fleshy protrusions, which other Pheru were compelled to consume. Shortly afterward, the Pheru began suffering widespread abortions and genetic deformities, and many were euthanized or released into the wild. Soon afterward, the humans and San'Shyuum who had been in the presence of the altered Pheru began to exhibit some symptoms of the powder-induced "disease". Affected on a psychological level by the strange illness, infected victims began to consume the sick Pheru, and anything they touched became infected while parts of themselves that were discarded, such as tissue and limbs, also became vectors for the disease. The afflicted then moved on to cannibalism and sacrifice of the infected, inducing a sacrificial individual to grow to prodigious size and then forcing uninfected individuals to consume them while they were still alive. During this time, the infection passed from human to San'Shyuum and human to human, but rarely San'Shyuum to human. The infected humans and San'Shyuum proceeded to spread the disease into other systems, which furthered the scope of the Flood outbreak.{{Ref/Reuse|origin}}


At this point, the Flood infestation, which had previously been predominantly a mind and behavior-altering affliction with only relatively minor physical changes, began to reshape its victims into a variety of forms designed to gather victims, engage in combat, and to rapidly consume useful biomass and other resources.{{Ref/Reuse|origin}}
At this point, the Flood infestation, which had previously been predominantly a mind and behavior-altering affliction with only relatively minor physical changes, began to reshape its victims into a variety of forms designed to gather victims, engage in combat, and to rapidly consume useful biomass and other resources.{{Ref/Reuse|origin}}


====Spread and withdrawal====
====Spread and withdrawal====
The infection quickly spread through both human and Forerunner space. Attempts to quarantine infected worlds and systems failed, leading to the Flood soon infecting hundreds of worlds in fifteen systems.{{Ref/Reuse|origin}} To halt the Flood's continuing spread, human fleets began destroying Flood-infested Forerunner ships and cleansing Forerunner planets where Flood infestations were detected. [[Forthencho]], the commander of the human fleets, chose not to warn the Forerunners of these actions to prevent giving the Flood time to expand.{{Ref/Game|Id=terminals4|H4|Detail=[[Terminal (Halo 4)|Terminals]]}} In turn, many Forerunners believed that the Flood was a fiction meant to hide humanity's expansionist aims. Ultimately, the Forerunners interpreted humanity's tactics as acts of aggression, leading to the [[Human-Forerunner wars]].{{Ref/Reuse|origin}}  
The infection quickly spread through both human and Forerunner space. Attempts to quarantine infected worlds and systems failed, leading to the Flood soon infecting hundreds of worlds in fifteen systems.{{Ref/Reuse|origin}} In an effort to halt the Flood's continuing spread, human fleets began destroying Flood-infested Forerunner ships and cleansing Forerunner planets where Flood infestations were detected. [[Forthencho]], the commander of the human fleets, chose not to warn the Forerunners in advance of these actions to prevent giving the Flood time to expand.{{Ref/Game|Id=terminals4|H4|Detail=[[Terminal (Halo 4)|Terminals]]}} In turn, many Forerunners believed that the Flood was a fiction meant to hide humanity's expansionist aims. Ultimately, the Forerunners interpreted humanity's tactics as acts of aggression, leading to the [[Human-Forerunner wars]].{{Ref/Reuse|origin}}  


With humanity severely weakened from the Flood infection and now fighting a two-front war, the Forerunners were surprised at the ease of their earliest victories against the humans. However, apparently without warning, the Flood began to retreat from its assault on humans. Forerunner ships found healthy human worlds within sectors of Flood infestation, leading Forerunners to conclude that humanity had developed a natural resistance, immunity or cure to Flood infection.{{Ref/Novel|Id=sil34|Sil|Page=34-37}} However, no immunity or cure to the Flood existed; the Flood had chosen to stop infecting humans.{{Ref/Novel|Id=p364|Pri|Page=364-365}} The [[Ur-Didact|Didact]] later speculated that the Flood's intent was to prevent humanity's extinction at the hands of the Forerunners by making it appear as if humans held a solution to Flood infection.{{Ref/Novel|Sil|Page=170}}
With humanity severely weakened from the Flood infection and now fighting a two-front war, the Forerunners were surprised at the ease of their earliest victories against the humans. However, apparently without warning, the Flood began to retreat from its assault on humans. Forerunner ships found healthy human worlds within sectors of Flood infestation, leading Forerunners to conclude that humanity had developed a natural resistance, immunity or cure to Flood infection.{{Ref/Novel|Id=sil34|Sil|Page=34-37}} However, no immunity or cure to the Flood existed; the Flood had chosen to stop infecting humans.{{Ref/Novel|Id=p364|Pri|Page=364-365}} The [[Ur-Didact|Didact]] later speculated that the Flood's intent was to prevent humanity's extinction at the hands of the Forerunners by making it appear as if humans held a solution to Flood infection.{{Ref/Novel|Sil|Page=170}}
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With the Proto-Gravemind dead, the smart-[[AI]] [[Serina]] was able to reacquire Anders' actual signal, which led to an ocean under which a docking port leading to the interior shield world was located. During the ''Spirit of Fire's'' descent, the outer surface of the ship was infested by the Flood. With the aid of Sentinels and "cleansing rings" controlled by the installation's AI, the ''Spirit of Fire'' crew were able to cleanse the ship and proceed into the shield world.
With the Proto-Gravemind dead, the smart-[[AI]] [[Serina]] was able to reacquire Anders' actual signal, which led to an ocean under which a docking port leading to the interior shield world was located. During the ''Spirit of Fire's'' descent, the outer surface of the ship was infested by the Flood. With the aid of Sentinels and "cleansing rings" controlled by the installation's AI, the ''Spirit of Fire'' crew were able to cleanse the ship and proceed into the shield world.


Within, the UNSC forces discovered that the Flood had managed to infest the interior of the shield world as well, though not to as massive of a degree as the surface planet itself. While rescuing Anders, Forge had to save her from three [[Flood infection form]]s and ran into some trouble with Flood forces on his following missions, though not to the massive extent they had been seen on the exterior planet.
Within, the UNSC forces discovered that the Flood had managed to infest the interior of the shield world as well, though not to as massive of a degree as the surface planet itself. While rescuing Anders, Forge had to save her from three [[pod infector]]s and ran into some trouble with Flood forces on his following missions, though not to the massive extent they had been seen on the exterior planet.


In order to prevent the Covenant from getting their hands on Etran Harborage's fleet of Forerunner {{Class|Sojourner|dreadnought}}s, a plan was created to use the reactor from the ''Spirit of Fire's'' [[Shaw-Fujikawa Translight Engine]] to induce the shield world's artificial star to go [[supernova]]. The plan was a success and Etran Harborage was destroyed. The explosion obliterated the Flood on the planet, along with the Covenant forces and the Forerunner fleet.{{Ref/Game|HW}}
In order to prevent the Covenant from getting their hands on Etran Harborage's fleet of Forerunner {{Class|Sojourner|dreadnought}}s, a plan was created to use the reactor from the ''Spirit of Fire's'' [[Shaw-Fujikawa Translight Engine]] to induce the shield world's artificial star to go [[supernova]]. The plan was a success and Etran Harborage was destroyed. The explosion obliterated the Flood on the planet, along with the Covenant forces and the Forerunner fleet.{{Ref/Game|HW}}


====Brief Recurrence====
====Brief recurrence====
{{main|Outbreak on the UNSC Spirit of Fire}}
{{main|Outbreak on the UNSC Spirit of Fire}}
On January 1, [[2537]], six years after the events on [[Trove]], a Flood outbreak was initiated aboard the {{UNSCShip|Spirit of Fire}} by a [[Pod infector]] that had managed to remain hidden aboard the ship. As the Flood threatened to breach quarantine, Serina awoke [[Jerome-092]] who, with the aid of Professor [[Ellen Anders]], was forced to exterminate all infected crew members, ensuring the survival of the ''Spirit of Fire'' and its remaining crew. All traces of the Flood parasite aboard the ''Spirit of Fire'' were erased.{{Ref/Comic|TFS|Detail=''[[Something Has Happened]]''}}
On January 1, [[2537]], six years after the events on [[Trove]], a Flood outbreak was initiated aboard the {{UNSCShip|Spirit of Fire}} by a [[Pod infector]] that had managed to remain hidden aboard the ship. As the Flood threatened to breach quarantine, Serina awoke [[Jerome-092]] who, with the aid of Professor [[Ellen Anders]], was forced to exterminate all infected crew members, ensuring the survival of the ''Spirit of Fire'' and its remaining crew. All traces of the Flood parasite aboard the ''Spirit of Fire'' were erased.{{Ref/Comic|TFS|Detail=''[[Something Has Happened]]''}}
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{{Main|Battle of Installation 04|Outbreak at the Containment Facility}}
{{Main|Battle of Installation 04|Outbreak at the Containment Facility}}
[[File:Anniversary, flood outbreak.jpg|thumb|300px|[[Jacob Keyes]] and his Marine squad are overwhelmed by the Flood during their expedition into a [[Flood containment facility]].]]
[[File:Anniversary, flood outbreak.jpg|thumb|300px|[[Jacob Keyes]] and his Marine squad are overwhelmed by the Flood during their expedition into a [[Flood containment facility]].]]
{{Quote|The only way to stop the Flood is to starve them to death.|[[Cortana]] to [[John 117]] and [[343 Guilty Spark]].}}
{{Quote|The only way to stop the Flood is to starve them to death.|[[Cortana]] to [[John-117]] and [[343 Guilty Spark]].}}


Although the first firing of the Halo Array starved the Flood that were at large in the Milky Way Galaxy, Flood specimens were kept in stasis within installations around the galaxy, including [[Installation 04]] and various Forerunner research facilities. This would prove to be a grave mistake, as both humanity and the Covenant stumbled upon  [[Installation 04|one]] of the abandoned Halo rings thousands of years after the firing of the Array. The UNSC [[Artificial intelligence|AI]] [[Cortana]], aboard the {{UNSCShip|Pillar of Autumn}}, made what was presumed to be a "blind" jump through Slipspace (in reality, she used translated co-ordinates from a [[Sigma Octanus IV artifact|Forerunner artifact]] found on [[Sigma Octanus IV]]) to evade Covenant pursuers. This led both groups to Installation 04, and in turn, the Flood that were kept there in stasis. After the crash of the ''Pillar of Autumn'' on the Halo ring, piloted by [[Captain (Navy)|Captain]] [[Jacob Keyes]], the surviving crewmembers dug in for what they believed would be a long and brutal guerrilla campaign against the Covenant forces on the ring.
Although the first firing of the Halo Array starved the Flood that were at large in the Milky Way Galaxy, Flood specimens were kept in stasis within installations around the galaxy, including [[Installation 04]] and various Forerunner research facilities. This would prove to be a grave mistake, as both humanity and the Covenant stumbled upon  [[Installation 04|one]] of the abandoned Halo rings thousands of years after the firing of the Array. The UNSC [[Artificial intelligence|AI]] [[Cortana]], aboard the {{UNSCShip|Pillar of Autumn}}, made what was presumed to be a "blind" jump through Slipspace (in reality, she used translated co-ordinates from a [[Sigma Octanus IV artifact|Forerunner artifact]] found on [[Sigma Octanus IV]]) to evade Covenant pursuers. This led both groups to Installation 04, and in turn, the Flood that were kept there in stasis. After the crash of the ''Pillar of Autumn'' on the Halo ring, piloted by [[Captain (Navy)|Captain]] [[Jacob Keyes]], the surviving crewmembers dug in for what they believed would be a long and brutal guerrilla campaign against the Covenant forces on the ring.
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While one of the Flood's main strengths lies in the decentralization of its compound mind and ability to be reborn from even the most carefully reduced remnant, it is nonetheless known to develop and assume a certain "core" Gravemind as an embodiment for its strategic intelligence. The Forerunners observed that the Flood exhibits a seemingly instinctive tendency to recoil and concentrate all of its otherwise distributed assets around this core when threatened on a large scale. A threat to the Flood's existence major enough to prompt such action was the imminent firing of the Halos, at which point the Flood gathered all of its available assets and launched an attack on the Ark.{{Ref/Game|H3|Detail=[[Terminal (Halo 3)|Terminal 3]]}}
While one of the Flood's main strengths lies in the decentralization of its compound mind and ability to be reborn from even the most carefully reduced remnant, it is nonetheless known to develop and assume a certain "core" Gravemind as an embodiment for its strategic intelligence. The Forerunners observed that the Flood exhibits a seemingly instinctive tendency to recoil and concentrate all of its otherwise distributed assets around this core when threatened on a large scale. A threat to the Flood's existence major enough to prompt such action was the imminent firing of the Halos, at which point the Flood gathered all of its available assets and launched an attack on the Ark.{{Ref/Game|H3|Detail=[[Terminal (Halo 3)|Terminal 3]]}}


The Flood is very effective on a psychological level, as its parasitic nature and gruesome appearance alone are a source of horror for most of its enemies and thus serve as powerful demoralizers. It is not uncommon for survivors of Flood encounters to be severely traumatized, often to the point of delirium, after witnessing their comrades get infected or being subsequently forced to kill said infected individuals.{{Ref/Level|CE|[[343 Guilty Spark (level)|343 Guilty Spark]]|Detail=[[Paranoid Marine]])}}{{Ref/Level|H3|[[Floodgate]]|Detail=[[Suicidal Marine]]}}
The Flood is very effective on a psychological level, as its parasitic nature and gruesome appearance alone are a source of horror for most of its enemies and thus serve as powerful demoralizers. It is not uncommon for survivors of Flood encounters to be severely traumatized, often to the point of delirium, after witnessing their comrades get infected or being subsequently forced to kill said infected individuals.{{Ref/Level|CE|[[343 Guilty Spark (level)|343 Guilty Spark]]|Detail=[[Paranoid Marine]]}}{{Ref/Level|H3|[[Floodgate]]|Detail=[[Suicidal Marine]]}}
{{Clear}}
{{Clear}}


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*[[Gersten]]
*[[Gersten]]
*[[Orlav]]
*[[Orlav]]
*[[Prophet of Mercy]]
{{col-2}}
{{col-2}}
*[[Prophet of Mercy]]
*[[Prophet of Regret]]
*[[Prophet of Regret]]
*[[Prophet of Truth]]
*[[Prophet of Truth]]
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*[[Mendicant Bias]]
*[[Mendicant Bias]]
*[[2401 Penitent Tangent]]
*[[2401 Penitent Tangent]]
*At least one Spartan from [[Fireteam Leviathan]]
{{col-end}}
{{col-end}}
==Non-canon and dubious canon appearances==
===Silver Timeline===
{{Notice/Silver}}
{{Quote|no=two|q1=What is it?|Kwan Ha|q2=It is the cohesion. The meaning. The final equilibrium. This is the end. This is the Flood.|The Mother|The Mother reveals the monster's true identity.{{Ref/Reuse|TVHalo}}}}
[[The Mother]] repeatedly warns [[Kwan Ha]] of a "monster" that is approaching in visions.{{Ref/Film|TV|Episode=[[Aleria (TV Series)|Aleria]]}}{{Ref/Film|TV|Episode=[[Onyx (TV Series)|Onyx]]}}
After accessing a Forerunner site on [[Onyx/Silver|Onyx]], Kwan, Dr. [[Catherine Halsey/Silver|Halsey]], and [[Miranda Keyes/Silver|Miranda Keyes]] are shown a [[star map]] documenting the Flood's spread, causing Kwan to realize that the monster is real.{{Ref/Film|TV|Episode=[[Thermopylae (TV Series)|Thermopylae]]}}
An overeager biologist named [[Janine Caryyew]] inadvertently releases Flood spores from within a sample container collected by Kwan, Halsey and Miranda, unleashing the Flood throughout the Onyx base. The Flood quickly consumes and converts most of the base's personnel, including [[Admiral]] [[Margaret Parangosky/Silver|Margaret Parangosky]]. While Halsey is infected, Miranda places her mother into stasis in the hopes of finding a cure. Kwan, [[Soren-066/Silver|Soren]], [[Kessler]] and [[James Ackerson/Silver|Ackerson]] manage to escape thanks to the intervention of the Mother who warns Kwan of the true nature of the Flood, but [[Laera]] remains behind after getting infected.{{Ref/Film|Id=TVHalo|TV|Episode=[[Halo (TV Series)|Halo]]}}
==Gameplay==
{{Main|The Flood/Gameplay}}
===Changes from Halo: ''Combat Evolved'' to ''Halo 2''===
*In addition to making low growls, the Flood make screeches and roars, which were not present in the first game.
*Their skin is more textured due to the improved graphics engine, giving the Flood a more realistic and necrotic look. The faces of the human forms are also more readily recognizable.
*If a combat form has both arms shot off, it will walk slowly then explode, releasing the Pod infector that was controlling it. This eliminated the Flood Buddy glitch.
*Rather than having to "gather bodies," the Flood can seemingly infect hosts over the course of a few minutes or even a few seconds, once again possibly due to the presence of the Gravemind, eliminating the need to gather bodies to form one.
*Rather than corpses reanimating themselves, a Pod infector will enter the body, then reanimate it, even if the form was just eliminated.
*If the player is attacked by a Pod infector while their shields are down, the character will die instantly. In ''Halo: Combat Evolved'', it would simply take a bar of health away.
*Some combat forms derived from Elites still have functional energy shields. However, they never possess active camouflage, as some in ''Halo: Combat Evolved's'' [[The Maw |final level]] did.
*Flood combat forms can use vehicles, albeit clumsily, and are also able to board the player's vehicle; they will then proceed to melee the player character and pull them from the vehicle.
*Melee attacks do little to no damage against the Flood in ''[[Halo: Combat Evolved]]''. They deal a bit more damage in ''[[Halo 2]]''.
*The Flood prefer to stay back and fire on the player rather than rush him. This could be because of the presence of the Gravemind, though, from a gameplay perspective, it is due to improved artificial intelligence.
*In ''Halo: Combat Evolved'' a combat form would walk slowly when shooting at the player. When losing the arm that shoots, it would charge the player character. In ''Halo 2'', combat forms either use a melee attack or shoot at the player in these situations.
*If a player is wielding an energy sword or shotgun, a combat form may retreat. They will not do this if a player is wielding other weapons.
*Unlike in ''Halo: Combat Evolved'', shooting one Pod infector will not result in the rest of the swarm exploding with it. However, Pod infectors are encountered in proportionally smaller numbers in comparison to ''Halo: Combat Evolved''.
*Pod infectors appear noticeably less textured and detailed than in ''Halo: Combat Evolved''.
*Flood Combat Forms do not "feign death" anymore.
*Splattering become more difficult as the Flood can use the vehicle momentum to hijack the vehicle.
===Changes from ''Halo 2'' to ''Halo 3''===
*Brutes may now be infected and transformed into combat forms.
*Melee attacks and plasma weapons were nearly useless against the Flood in ''Halo: Combat Evolved'' and ''Halo 2'', but now can be used effectively against the Flood. The Flood are much more vulnerable to ballistic weapons, as well.
*Pod infectors can mutate humans, unshielded Elites and Brutes into combat forms within seconds (as seen during [[Floodgate]]).
*Pure forms are introduced.
*Combat forms wield weapons far less frequently than in ''Halo: Combat Evolved'' and ''Halo 2''.
*Carrier forms release significantly more Pod infectors when they explode. The explosion does not push the player away much as in ''Halo: Combat Evolved'' and ''Halo 2''. In addition, carrier forms are significantly more difficult to kill with projectile weapons, but they are easily destroyed by plasma weapons.
*Running over Pod infectors while driving a vehicle can result in loss of steering and possibly overturning of the vehicle. Any Pod infectors that are hit by the vehicle will not pop.
*Flood combat forms can no longer commandeer vehicles, like they could in ''Halo 2''.
*Sticking a carrier form with a {{Pattern|Anskum|plasma grenade}} or [[Spike Grenade]] will kill both the carrier form and the pod infectors it carries. This is also true of a [[Kemuksuru|supercombine explosion]].
*Any weapon wielded by humans, Elites, and Brutes will not be dropped when transforming into combat forms and the combat forms will be also unarmed.
*Any humans, unshielded Elite, and Brutes have a low chance to resist or preventing the Pod Infector from infecting them.
*Any Pod infector latching into surviving humans, Elite, and Brutes before the infection can be shot at to prevent infection.
===Changes from ''Halo 3'' to ''Halo Wars''===
''Significant changes to the Flood's general existence were necessary due to the change of genre from first-person shooter to real-time strategy game. These are as follows.''
*Many new forms, such as [[Flood bomber form|bomber forms]], were created for ''Halo Wars'' to expand the "roster" of Flood units. The official explanation is that these forms were created from creatures indigenous to [[Trove]].
*Combat forms have more tentacles than before; they resemble spikes rather than flexible appendages.
*Grunts and Jackals can be converted to combat forms.
*Pod infectors do not explode when they are shot in the cinematics, instead 'deflating' like punctured balloons, though they still explode in gameplay.
*Carrier forms do ''not'' always explode upon death.
*Hero Units that do not have shields will be instantly downed regardless of any remaining HP on them, featuring an instant kill on any enemy infantry without energy shielding.
===Changes from ''Halo Wars'' to ''Halo Wars 2''===
*The Flood now has a Super Unit, The Abomination.
*New forms are introduced, such as [[Flood spawner form]]s, which can spawn Flood forms on the move and can spawn counter units.
*The Flood now only infects the Squad Leader(Either Jiralhanae or Sangheili depending on the Leader) in a Grunt Infantry unit, while the rest are killed. Marine units are entirely infected, retaining ''Halo Wars'' infection traits for humans.
*Pod infectors can now be killed more effectively with units that deal splash damage.
*The Flood can now infest and commandeer vehicles that are still operational, except Super Units and mechanical units (Mainly Sentinels).
**[[Seeder infector]], a new variety of Infection Form that is able to infect air units, is introduced.
**[[Flood infester form|Flood infestor]], a new kind of pure form, is introduced and specialized in infecting the vehicles.
**Infected mechanical vehicles are immune to Isabel's '''Ghost In The Machine''' Leader Power.
*Turret defenses have had their effectiveness reduced against Pod infectors, even those equipped with anti-infantry upgrades.
**Mega Turret and Siege Turret were exempted from this due to providing splash damage.
*The infection process affects all units. If the Pod Infector units doesn't match its victim (For example, Pod Infestor attacks infantry unit is not match for infection), it will be destroyed or killed. If match, the infection process can be started.
**Any infected units will revert their health back to 100% once the infection process has been completed.
**Infection process can be started once a unit is dying (Red Health).
*New structures for barricades are introduced.
*Pod infector squad size increased 3 to 4 times.
*Biohazard sign appears every time a unit has gotten infected.


==Gameplay==
==Gameplay==
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*Running over Pod infectors while driving a vehicle can result in loss of steering and possibly overturning of the vehicle. Any Pod infectors that are hit by the vehicle will not pop.
*Running over Pod infectors while driving a vehicle can result in loss of steering and possibly overturning of the vehicle. Any Pod infectors that are hit by the vehicle will not pop.
*Flood combat forms can no longer commandeer vehicles, like they could in ''Halo 2''.
*Flood combat forms can no longer commandeer vehicles, like they could in ''Halo 2''.
*Sticking a carrier form with a {{Pattern|Anskum|plasma grenade}} or [[Spike Grenade]] will kill both the carrier form and the pod infectors it carries. This is also true of a [[Subanese crystal|supercombine explosion]].
*Sticking a carrier form with a {{Pattern|Anskum|plasma grenade}} or [[Spike Grenade]] will kill both the carrier form and the pod infectors it carries. This is also true of a [[Kemuksuru|supercombine explosion]].
*Any weapon wielded by humans, Elites, and Brutes will not be dropped when transforming into combat forms and the combat forms will be also unarmed.
*Any weapon wielded by humans, Elites, and Brutes will not be dropped when transforming into combat forms and the combat forms will be also unarmed.
*Any humans, unshielded Elite, and Brutes have a low chance to resist or preventing the Pod Infector from infecting them.
*Any humans, unshielded Elite, and Brutes have a low chance to resist or preventing the Pod Infector from infecting them.
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**[[Seeder infector]], a new variety of Infection Form that is able to infect air units, is introduced.
**[[Seeder infector]], a new variety of Infection Form that is able to infect air units, is introduced.
**[[Flood infester form|Flood infestor]], a new kind of pure form, is introduced and specialized in infecting the vehicles.
**[[Flood infester form|Flood infestor]], a new kind of pure form, is introduced and specialized in infecting the vehicles.
**Infected mechanical vehicles are immune to Isabel's '''Ghost In The Machine''' Leader Power.
*Turret defenses have had their effectiveness reduced against Pod infectors, even those equipped with anti-infantry upgrades.
*Turret defenses have had their effectiveness reduced against Pod infectors, even those equipped with anti-infantry upgrades.
**Mega Turret and Siege Turret were exempted from this due to providing splash damage.
*The infection process affects all units. If the Pod Infector units doesn't match its victim (For example, Pod Infestor attacks infantry unit is not match for infection), it will be destroyed or killed. If match, the infection process can be started.
*The infection process affects all units. If the Pod Infector units doesn't match its victim (For example, Pod Infestor attacks infantry unit is not match for infection), it will be destroyed or killed. If match, the infection process can be started.
**Any infected units will revert their health back to 100% once the infection process has been completed.
**Any infected units will revert their health back to 100% once the infection process has been completed.
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*''[[Halo: Combat Evolved Anniversary]]''
*''[[Halo: Combat Evolved Anniversary]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
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*''[[Halo: Primordium]]''
*''[[Halo: Primordium]]''
*''[[Halo 4]]''
*''[[Halo 4]]''
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*''[[Halo: Spartan Assault]]''
*''[[Halo: Spartan Assault]]''
*''[[Halo: Escalation]]''
*''[[Halo: Escalation]]''
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*''[[Halo: Mortal Dictata]]'' {{Mo}}
*''[[Halo: Mortal Dictata]]'' {{Mo}}
*''[[Halo: Broken Circle]]'' {{Mo}}
*''[[Halo: Broken Circle]]'' {{Mo}}
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*''[[Halo: The Rubicon Protocol]]'' {{Mo}}
*''[[Halo: The Rubicon Protocol]]'' {{Mo}}
*''[[Halo: Outcasts]]'' {{Mo}}
*''[[Halo: Outcasts]]'' {{Mo}}
*''[[Halo: Saturn Devouring His Son]]''
*''[[Halo: The Television Series]]''
**''[[Unbound]]'' {{Mo}}
*''[[Halo: The Television Series Season Two]]''
**''[[Sanctuary (TV Series)|Sanctuary]]'' {{C|Visual allusion}}
**''[[Thermopylae (TV Series)|Thermoylae]]'' {{C|Visual allusion}}
**''[[Halo (TV Series)|Halo]]''
*''[[Halo: Epitaph]]''
{{col-end}}
{{col-end}}