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

Hmmm.... this conjures up images of a family of Zoomers moving into my attic and gnawing on the electrical wiring. Some squirrels did that last year and cut off the power to my room.

But in all seriousness, I think it really depends on the number, location, and specifics of the "insertion". An extreme example: a single Zebesian Space Pirate dumped in the middle of the Australian outback with no supplies or equipment would not only die of dehydration before being able to kill anybody but would probably never even be FOUND, while a full invading army of them with weapons, ships, and cohesive strategy could very easily wipe out most of Humankind. I'd have to side with either X or Gorea: most other species including the major bosses could only cause considerable mayhem before one of the major nation-states decided to drop a nuke on them and deal with the threat before it got beyond eliminating a major city. A huge disaster, yes, but hardly extermination. Even things like the Ing could be contained if they were recognized early enough, which in today's environment of hyperfast communication is almost a given. But we have absolutely no means of taking out Gorea or the X parasites, the latter of which also possess the ability to potentially infiltrate the highest levels of power by infecting important people before anybody realized what was happening.