User blog comment:Garfield 123/What Alien Species From Metroid Would Be the Largest Threat to Mankind in Today's World?/@comment-1901106-20101021231358/@comment-1901106-20101031191024

Gorea, the big cancerous bloom that wiped out the Alimbic civilization in Hunters. It can apparently resist nuclear detonations, shape-shift, and even self-replicate.