Halo: What Is the Flood in the Season 2 Finale?

The Flood is one of the Halo games’ most formidable enemies and now they’ve arrived on the TV series. Here’s what you need to know about this new threat.

Halo Season 2 Episode 8
Photo: Adrienn Szabo/Paramount+

This Halo article contains spoilers.

It’s not long after Halsey, Miranda, and Kwan discover the ancient Forerunner device that ONI scientists and UNSC officers start chomping down on each other. They’ve been infected with the strange spore contained inside the device and now everyone, including Admiral Parangosky and Laera, are lunch. What the hell is happening and what does it mean for Halo season 3?

It’s time to meet the Flood in the Silver Timeline. They’ve arrived much earlier than in the game, already spreading beyond the Halo ring long before Master Chief and Cortana even have a chance to stop the alien parasite from consuming everything in its path. It’s perhaps the show’s biggest deviation from the source material and will likely mean the Flood storyline plays out much differently than it did in the Halo trilogy. But at the same time, from what we see in the Halo season 2 finale, the basic function of the Flood in the Silver Timeline seems to remain the same: infect anything and everything until there’s nothing but the Flood left.

First introduced in Halo: Combat Evolved, the Flood quickly become the main threat of the original trilogy of games, as it begins quickly consuming both the humans and the Covenant once its accidentally freed from its quarantine on the Halo ring. Once unleashed, the Flood doesn’t just take over the Covenant capital world of High Charity but it eventually makes its way to Earth. By the end, what’s left of the UNSC and ex-Covenant forces who have broken off from the enemy faction must work together to stop the Flood for good.


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