T4R
As we all know The Flood are an integral part of the Halo Universe, I was surprised that they weren't featured in Halo 4 to be honest.
When do you think we'll see them?
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Considering how the Flood have evolved from game to game, (compare Halo CE's Flood who would move slowly and whip the enemy until they died to Halo 4's Flood with talons powerful enough to kill a spartan in one hit,) I'm pretty scared to see how the galaxy would fare against the Flood at that point. Hopefully they don't return.