The Others' are a species of invading aliens and the primary antagonists of the novel and film series The 5th Wave.
The Others began their assault on humanity first by unleashing a massive EMP that disabled all electronic technology worldwide. Relatively few humans were killed, most of them in car or plane crashes when their vehicles no longer functioned. The second, quite literal wave took the form of massive global tsunamis triggered by the Others, which wiped out every coastal city on the planet. For the third wave, the Others mutated avian flu to be airborne and much more contagious.
With most of humanity wiped out, the Others assumed the form of humans and began to pick them off with guns. These alien snipers were known as Silencers. Since the Others blended in with humans and no one knew their true form, no one could trust anyone anymore. For the fifth, and most insidious wave, the Others infiltrated the U.S. military and took all surviving children to an Ohio military base, claiming to provide them sanctuary. In reality, they planned to create an army of child soldiers to wipe out all survivors, manipulating the children into thinking that the survivors were possessed by the aliens.