Damn (an Umbrella Academy fic)

On the 12th hour of the first day of October 1989, 43 women around the world gave birth.
This was unusual only in the fact that none of these women had been pregnant when the day first began.
Sir Reginald Hargreeves, eccentric billionaire and adventurer, resolved to locate and adopt as many of the children as possible.
He got seven of them.

But when Five Hargreeves returns to his 13-year-old body claiming to have visited a post-apocalyptic future that they must stop, there are more than seven powered children fighting.