15 Life Threatening Outbreaks In Video Games

Halo – The Flood

The Flood is the oldest and most fearsome organism in the universe. They infest other species, taking them as hosts and moving on to the next race. They almost took over the entire universe before the Forerunners built the Halo arrays and wiped them from existence, or so they thought. They returned thousands of years later, stepping right in the middle of the war between Humanity and the Covenant, almost bringing civilization to its knees once more.