Halo’s The Flood Monsters Explained. The Flood are a mutated and corrupted form of the Halo Universe’s oldest race The Precursors, which infected ancient humans and created the parasitic ...

As The Flood spreads, Chief saves Cortana and is finally reunited with his AI companion. He is also forced to crash-land on the Halo ring and is met there by Makee and her doting warrior, the Arbiter.