- last post: 01.01.0001 12:00 AM PDT
I think the Flood were originally a type of parasidic fungus (like athlets foot). The Forerunner were experimenting on this fungus that they had found. The Experiments must have caused the Flood to mutate and take control of its host. Now beings a fungus, the Flood produced spores which landed on living beings, thus spreading the Flood. The Forerunner noticed how fast the Flood could spread and decided to make Halo. The Forerunner must have triggered off Halo and whipped out the Floods soon to be hosts. They then must have captured a few "specimens" and transported them too Halo where they could be in a controlled enviroment (specimens would have included life forms other than the Flood). For some unknowen reason the Forerunner dissapeared, leaving the Flood to make hosts of the wildlife (in a controlled way so they would not escape their "cages"), that is why they were still there when MC crash landed on Halo. And you know the rest about how the covies released the Flood, making them a new enemy for the MC to fight