In the future, we are all vampires, but we're running out of viable blood, since our future selves decided to turn the remaining humans into a Matrix-style blood farm. Watch what happens when Daybreakers' vampires run out of blood.
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five per cent of the human population still seems like quite a lot - from 5 billion, that's 250million? Surely enough, with some rationing... typical greedy bloodsuckers...