User blog comment:Garfield 123/What Alien Species From Metroid Would Be the Largest Threat to Mankind in Today's World?/@comment-2015332-20101020223422

Let's also remember the fact that not only can the X kill a race's best warriors and become a copy of them, but it can also make as many copies as they want of those warriors. Near the end of Fusion, you learn that there are at least 10 SA-Xes (THAT WOULD HAVE STUNK IF YOU HAD TO FIGHT THEM ALL) on the ship. Could you imagine an entire army of Samuses? Each one would potentially be capable of defeating an entire army if not many armies. This does not even take into account the fact that the X gains all of the knowledge of its host. The X is also immune to all weaponry. The only way to kill an X is for it to be absorbed by someone who is immune to it. The only way to become immune is to be infected by the parasite and then be cured with a Metroid vaccine. Considering the fact that there are no Metroids in real life and the incredibly rapid rate of reproduction, we would be extinct in a lot less than 2 years along with every other advanced life form on this planet. The only alien race that would even come close to being such a threat (besides The Thing) would be the Chimera from the Resistance series. They are capable of turning humans into troops that are physically superior to any human athlete with the use of a virus. They can also use multiple bodies to create massive creatures as large as 300 feet tall (only one of these was made in the series so far). They possess technology far superior to ours (ex: energy weapons, massive airships, massive mobile artillary, hovering attack drones small enough and manuverable enough to fly through a house's front door, force fields, etc.). Chimera are also capable of regenerating tissue very rapidly. This allows them to heal from wounds in a matter of minutes and even seconds. HOLY LUMINOTH! I did not expect my comment to be this long, lol.