Zombies, who knows.
Aliens probably. It's a big universe. We can't be the only ones here.
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Cdc has proven zombies (typical undead) would fail quickly. Now if it's a disease that drives you crazy, probably still will fail. Aliens probably but not guaranteed
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Eh, I guess. There has to be aliens. There's no way that Earth can be the only planet with life.
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Hopefully they're nice aliens.