The world had become used to the metahumans--people sometimes perfectly
ordinary, but sometimes quite extraordinary in appearance--who mostly
worked with their governments as high-powered peace officers, fighting
crime, and sometimes fighting rogue metahumans who had become
super-criminals. Then that comfortable world ended in just one
terrifying day.
Suddenly, all world governments were simultaneously attacked by soldiers
in giant mecha robotic suits with the swastika symbol of the Third Reich
on their metal arms. If these were Nazis, where had they been hiding
since the end of World War II? And where had they gotten armor and
weapons far in advance of anything on the planet? Weapons against which
even the metahuman heroes seemed to be helpless...