With all three items recovered, Mordru unleashes three demons imprisoned for 1,000 years.
The Justice League of America and the Justice Society of America, fall back, through time, to the 20th century. The Black Canary, and the Green Arrow, have been miniaturized, and trapped within an hourglass, rapidly filling with sand. The Justice League of America, and the Justice Society of America, were accidentally drawn to the 30th century, by the evil sorcerer, Mordru. The Justice League of America, and the Justice Society of America, were tasked, by Mordru, to recover the Red Jar of Calythos, the Green Bell of Uthool, and the Silver Wheel of Nyorlath.
Using these three mystic items, Mordru released the Demons Three--Abnegazar, Ghast, and Rath--from their century long imprisonment. When Mordru demanded their power, the Demons Three struck him down. Lightning Lad, Ultra Boy, and Wildfire rush the Demons Three, only to find themselves mystically shackled to the wall. The Demons Three destroy the Red Jar of Calythos, the Green Bell of Uthool, and the Silver Wheel of Nyorlath. With those items destroyed, the Demons Three can never be imprisoned again. The Demons Three enchant Brainiac 5, Saturn Girl, Sun Boy, and Ultra Boy, and task them with returning Mordru's spirit form to Mordru's tomb.
The movement of Mordru's form upends the hourglass, saving the Black Canary, and the Green Arrow, from a suffocating death. After a century of imprisonment, the Demons Three are at odds with how to move forward. Abnegazar wishes to become a part of humanity. Rath wishes to enslave humanity. Ghast wants to destroy the world. The Demons Three go to war with one another. Their eldritch power proves to be equal to one another, and thus, no victor can be declared. The Demons Three decide to use proxies to fight their war. Abnegazar convinces the Legion of Super-Heroes to champion his cause.
Ghast and Rath draw the Justice League of America, and the Justice Society of America, back through time. Rath attempts to subjugate Doctor Fate, to use his mystic power to enchant the Justice Society of America. When Doctor Fate resists, Rath instead uses the Golden Age Flash's super-human speed to mesmerize the Justice Society of America. Ghast forces the Silver Age Green Lantern to use his power ring to dominate the Justice League of America. The Justice League of America begin battling the Justice Society of America. The Legion of Super-Heroes joins the fight.
Wildfire blasts Superman out of the Legion of Super-Heroes headquarters, moving the fight out into the street. Ghast, realizing that his forces are outnumbered, sends the Silver Age Green Lantern to collect the Black Canary, and the Green Arrow. The Silver Age Green Lantern severs the hourglass chain around Mordru's neck. The Green Arrow shatters the hourglass. The Silver Age Green Lantern places the Black Canary, and the Green Arrow, under Ghast's command. The Silver Age Green Lantern attacks Saturn Girl, only to have her telepathic powers usurp control of his power ring.
The Black Canary's sonic cry breaks Saturn Girl's concentration, allowing her to be subdued. The Green Arrow, and the Silver Age Green Lantern, take out Brainiac 5, Sun Boy, and Ultra Boy. The Silver Age Green Lantern then funnels Mordru's spirit essence back into Mordru's tomb. The Justice League of America, and the Justice Society of America, defeat the Legion of Super-Heroes. Ghast teleports the Batman, and Superman away, to fulfill a new task. Rath tasks Doctor Fate, and the Golden Age Green Lantern with taking the crew of an Earth tunneling bathysphere hostage.
Rath orders the President of Earth to turn power over to him, or else Rath will collapse the global tunnel, murdering thousands of innocent people. Princess Projectra, and Wildfire, ambush Doctor Fate. With the global tunnel secure, Wildfire takes out the Golden Age Green Lantern, releasing the hostages in the geo-lab. The Silver Age Green Lantern struggles against Power Girl. Wildfire takes both combatants out. The Justice League of America have come to realize that they still maintain some degree of free will. The Black Canary devises a strategy to win the day.
The Justice League of America decide to allow the Legion of Super-Heroes to defeat them. The Batman, the Black Canary, the Green Arrow, and Superman are tasked, by Ghast, with destroying Ice City. Superman allows Shadow Lass, and Wildfire to take him out. The Batman is distracted by one of Princess Projectra's illusions, allowing Chameleon Boy to snatch a bomb away from the Batman. Lightning Lad subdues the Batman, the Black Canary, and the Green Arrow. The Golden Age Flash battles against Princess Projectra.
With a little unseen help from Superman, Princess Projectra is able to stalemate the Golden Age Flash. The Golden Age Hawkman battles against Chameleon Boy. Unseen by all, the Black Canary detonates the bomb, with a sonic cry. Adopting the Golden Age Hawkman's form, Chameleon Boy fights the Winged Wonder to a stalemate. Angered at their proxies' inability to claim victory, Abnegazar and Rath turn on one another. Abnegazar and Rath destroy one another, in a mystic explosion absorbed by Doctor Fate. The Justice League of America, the Justice Society of America, and the Legion of Super-Heroes team up against Ghast.
Doctor Fate uses his amplified mystic powers to draw the shattered pieces of the Justice League of America's satellite headquarters together, around Ghast. Lingering residue from the Red Jar of Calythos, the Green Bell of Uthool, and the Silver Wheel of Nyorlath, within the Justice League of America's trophy room, proves enough to imprison Ghast inside the satellite. With the crisis passed, the Justice League of America, and the Justice Society of America, return to their proper place in space, and time.