pilaboy is correct, one of the theories is that batman was sent back to the dawn of time.
the main storyline have 7 issues, though merong mga tie-ins, like FC:Resist, FC:Submit, FC: Revelations, etc.
and in FC: Requiem.. J'onn J'onzz (Martian Man Hunter) was murdered.
http://rapidshare.com/files/204224976/Final_Crisis_-_Requiem_01__2008___RacerX-DCP_.cbr