User blog:TejonMieleroXL777/Which of all this alien species are a true threat for the humanity?

Well how all of ours have been see, i watched what the humans have a lot of enemys, and i decided put here all the alien species more powerful than the humans have faced-off, and now i wanna what you say me which of this species of videogames, movies, tv shows, and others universes are a true threat for ours.
 * a)The Xenomorphs
 * b)The Yautja
 * c)The Reptilians who a lot of people think what now where into our societys and are trying to quit our planet to us.
 * d)The Drej from Titan A.E
 * e) The Covenant from Halo
 * f)The Necromorphs from Dead Space
 * g) The martians from War of the Worlds of 2005
 * h)The Locust of Gears of War
 * i)The Irken
 * j)The insectoid invaders from Star Ship Troopers