The Flood

"One single Flood spore can destroy a species."

- Rtas Vadum, explaining his decision to glass New Mombasa

The Flood are one of the two main villainous groups in the Halo videogame series, the other being the Covenant.

They are an ancient alien race of parasites capable of assimilating any other organic life-form and turning them into flood zombies, and if left unchecked could consume all other sentient life in the universe. Thousands of years 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 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.

The Flood are all controlled by an intelligent hive mind called the Gravemind, who often speaks through his Flood zombies. Gravemind and the Flood are seemingly destroyed once and for all at the end of Halo 3, but they could return again eventually.

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