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One single Flood spore can destroy a species.
~ Rtas Vadum explaining his decision to glass New Mombasa.

The Flood are the central antagonistic faction of the Halo franchise. They are one of the two main antagonistic factions (alongside the Covenant) of the original Halo trilogy, serving as major antagonists in Halo: Combat Evolved, the secondary antagonists of Halo 2 and one of the two main antagonistic factions (alongside the Covenant Loyalists) of Halo 3. They are an ancient alien race of parasites capable of assimilating any other organic life-form and turning them into mindless zombies, and if left unchecked could consume all other sentient life in the universe. Eons ago, the Forerunner race were at war with the Flood and created the Halo space installations as a last resort to kill all other life in the galaxy so that the Flood would starve to death. It is the goal of the Covenant to activate the Halos, which they mistakenly believe will send them on a "Great Journey" to godhood.

It was revealed that the Flood were originally Precursors, an advanced race that created all other races in the galaxy (including Forerunners and Humans). The Forerunners rebelled against Precursors, nearly exterminating all of them. However, some Precursors survived, turning themselves into dust and powder. But the powder was corrupted and thus, The Flood was born. The Primordial is the only remaining Precursor alive.

The Flood are all controlled by an intelligent hive mind called the Gravemind, who often speaks through his Flood zombies. The Flood and Gravemind are seemingly destroyed once and for all following the events of Halo 3 when the Ark is destroyed by Master Chief John-117, however it is a possibility that the Flood could return again if any Flood life still persists.



  • Gravemind
  • Proto-Gravemind
  • Juggernaut Form (cut)
  • Pure Form
    • Stalker Form
    • Ranged Form
    • Tank Form
    • Infector Form
    • Transport Form
    • Stealth Form
  • Combat Form
    • Human Combat Form
    • Sangheili Combat Form
    • Jiralhanae Combat Form
    • Kig-yar Combat Form
    • Unggoy Combat Form
    • Active Camouflage Combat Form
  • Carrier Form
    • Shielded Carrier Form
    • Combat Carrier Form
  • Infection Form


Mission Appearances

Halo: Combat Evolved

  • 343 Guilty Spark
  • The Library
  • Two Betrayals
  • Keyes
  • The Maw

Halo 2

  • The Oracle
  • Sacred Icon
  • Quarantine Zone
  • High Charity

Halo 3

  • Floodgate
  • The Covenant
  • Cortana
  • Halo

Halo Wars

  • Anders Signal
  • The Flood
  • Shield World
  • Cleansing
  • Beachhead
  • Reactor



            Halo.png Villains

The Flood | Huragok | Mgalekgolo | Jiralhanae | Kig-Yar | Sangheili | San Shyuum | Unggoy | Xalanyn | Yanme'e

Covenant Empire
Covenant High Council: Prophet of Truth | Prophet of Mercy | Prophet of Regret
Covenant Forces: Ardo 'Moretumee | Bako 'Ikaporamee | Field Marshal | Kasamee | Lat 'Ravamee | Lepidus | Luro 'Taralumee | Merg Vol | Ontomee | Parabum | Re'gish Wamik | Rho 'Barutamee | Ripa 'Moramee | Rtas Vadum | Tartarus | Thel 'Vadam

Storm Covenant
The Didact | Jul 'Mdama | Gek 'Lhar | Parg Vol | Kitun 'Arach

Cortana | Warden Eternal | Guardians | Prometheans

The Banished
Atriox | Decimus | Let 'Volir | Escharum | Jega 'Rdomnai | Hyperius | Tovarus | Tremonius | Chak 'Lok | Okro 'Vagadunn | Bassus | Harbinger

Office of Naval Intelligence
James Ackerson

Jerald Mulkey Ander | Robert Watts

343 Guilty Spark | Commissioner Kinsler | Gravemind | Heretics (Sesa Refumee)

Halo: Legends
Haka | Pluton