This is when the reborn take over the planet. They kill as many humans as possible until Humans finally over power them and they survive as the story goes. However a descendent of the original scientist comes about and takes over where the first left off killing more humans. The Reborn are very equipped to kill they kill and the dead become the reborn. So the humans are out numbered by a substantial number of Reborn who are the rejuvenated people to live on earth and take from the meek.