Apokolips led by Steppenwolf has wiped out Metropolis and pretty well conquering Earth and in a last mad desperate gamble. The Trinity of Superman, Wonder Woman and Batman manage to free the world from the Parademon grip, sacrificing themselves in the process in grand fashion.
Five years later on the anniversary of the Trinity deaths to save the earth.
Sitting silently by himself in the woods depress by Joan words. Jay Garrick meets Mercury after witnessing him crash near by in a crater.