Ok now if u have seen the toon Flash vooruit, voorwaarts u would now how everything happened but i will scim through the basics:
On an unknown datum everyone on the face of the earth was blacked out for 137 seconden (2mins 17secs). Most people saw a vision of April 29th 2009 approx. 6 months from present day.
Some people saw nothing,Blackness- indicating that they will not be alive in 6 months time. One of these people is an FBI dective named Demitri Noh. Demitri eventually finds out that he was shot several times in the chest two days before the flashforward time.