Well, imagine you are pulled from reality and onto a wierd base floating in the centre of space. And that the people on the base want you to repopulate the earth.
Then you're there.
A desperate mortal hunts our species down one by one to gain ultimate power What happens when they gain your world as it is in great danger your parents keep your past lock up and say its to save our world, but there another half of you out there, but you are unsure where it is.