Crisis on Infinite Earths (1985-) #3

The heroes of the DCU are only beginning to realize the scope of the danger they are in, and it may already be too late. The Flash inexplicably disappears; the Teen Titans try desperately to curb the death and destruction caused by this cataclysmic event; and the Legion of Super-Heroes stand helpless as a wave of anti-matter threatens to wipe them and their world from existence forever.