Doomsday Nebula

During a scientific expedition to Pluto, the entire crew vanished. The unmanned spacecraft suddenly returned to Blue Star, after which a mysterious organization took control and bombarded Blue Star with all its nuclear missiles. Nine out of ten humans perished. Worse still, Blue Star's creatures evolved into monsters that hated humanity. The surviving humans built giant cities to hold off the beasts, barely clinging to life with the help of an unknown civilization!