Earth faces its ultimate reckoning when the Justice League decides to launch a preemptive strike against Darkseid on Apokolips, driven by a desperate desire to end his multiversal tyranny once and for all. John Constantine masterminds the dangerous plan, though warning signs are ignored. The assault goes disastrously wrong. Darkseid anticipated the attack, deploying an army of upgraded, magic-dampening Parademons known as Doomsday-fused Furies. The resulting massacre is catastrophic; heroes are slaughtered en masse, while others are captured, brainwashed, or cyborg-mutilated to serve as Darkseid's personal guard.Two years later, Earth is a desolate wasteland. Darkseid’s harvester engines are draining the planet's core, and surviving humanity lives in fear. Constantine has descended into alcoholic despair, drowning in survivor’s guilt. A battered Superman, whose powers have been neutralized by liquid kryptonite coursing through his veins, tracks down Constantine. Superman refuses to surrender and recruits a fractured, ragtag resistance: Raven, whose demonic father Trigon is imprisoned within her; Etrigan the Demon, now struggling with his mortality; and a newly arrived Swamp Thing.Realizing raw strength is insufficient, the group embarks on a high-stakes mission to free and rally scattered heroes. They infiltrate Lex Luthor’s tower to use a Mother Box, but discover Luthor has been working as a double agent for Lois Lane. The team rescues a traumatized, cybernetically altered Flash from
the Suicide Squad. Flash reveals how the timeline broke and explains his crucial role in resetting reality.Motivated to save what remains, the heroes launch a desperate final offensive on Apokolips. The battle is ferocious and deeply tragic. Etrigan makes the ultimate sacrifice in a brutal clash against a brainwashed Superman, successfully shocking
the Man of Steel back to his senses using magic. Meanwhile, Raven confronts her father Trigon, releasing him to battle Darkseid. The titanic clash between the cosmic entities wreaks havoc, but Constantine intervenes, manipulating Raven to wrest control from Trigon and destroy the demonic entity once and for all.With Darkseid's forces weakened and his harvester machines critically damaged, Superman leads the surviving heroes in detonating the planet's core. As Apokolips self-destructs, Darkseid is presumably defeated along with his empire. Back on a ruined Earth, the survivors survey the staggering death toll. Knowing the planet cannot recover from the ecological collapse, Flash realizes the only way to ensure a future for humanity is to run back in time once more, willingly sacrificing the present timeline to create a new dawn and spare his fallen comrades from their horrific fates.