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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2 for the Reclaimer Trilogy. There'll definitely be spinoffs though, so if the Flood are coming back(and from Primordium I'm pretty sure they are) humanity will probably fight them back/get wiped out by the end of Halo 6.