User blog comment:Garfield 123/What Alien Species From Metroid Would Be the Largest Threat to Mankind in Today's World?/@comment-2250198-20101022012913

I've got it! Reaper Vine. Never seen one killed, they would infest old buildings and that whole side of town would have to be leveled in order to clear it out. (Heck we don't even know what a reaper vine connects to!)