Justice League of America #17

Double trouble for the League! First, in the lead story written by Alan Burnett, a mysterious and familiar team from beyond time has infiltrated the Hall of Justice looking for a weapon. Will Black Lightning be their first victim? And wait 'til you see who they are! Plus, writer Dwayne McDuffie begins a very special back-up story exploring what's wrong with Vixen's powers. And when her condition worsens, it leads to a new arc and major change for the Leaguer!