When time travel allows a past wrong to be righted for The Flash and also his loved ones, the ripples of the event prove disastrous because of fractured, alternate reality exists at which a Justice League never formed, and even Superman is nowhere to be found. Teaming with a grittier, more violent Black Knight and Cyborg races while the new world is ravaged by a ferocious war between Wonder Woman's Amazons along with Aquaman's Atlanteans to restore the character of his initial timeline.