After Crisis On Infinite Earths, a new single DC Universe is created. In History of the DC Universe, Harbinger gathers data on the Monitor’s files in order to tell its history. In the beginning, a single universe was created. When the universe was young, the earliest race was the Maltusians. These tall, blue-skinned beings lived on Oa and soon mastered science. With their civilization, they studied the universe. According to legend, no one could behold the beginning of the universe.

Or else, calamity would follow. A daring and defiant scientist, Krona defied the legends. With his powerful machine, he peered back in time. Then, he showed his discovery to the Maltusians. On that day, calamity ensued and Krona was struck by a lightning bolt. Dramatically, the accident created the anti-matter universe opposite to the positive matter universe. And the multiverse was born. With the birth of the multiverse, evil entered the DC universe.

Perhaps, you have watched the animated movie called Green Lantern: Emerald Knight. In DC comics continuity, Krona is banished. Soon, he drifts to Nekron’s realm of the dead. There, he is recruited into Death‘s army which seeks to destroy then recreate the universe. Indeed, Krona welcomes it as an opportunity to study the destruction and the creation of the universe.

Then, Nekron sends Krona and his army of the undead to kill the Guardians of the Universe and the Green Lantern Corps. Violently, the army of the unliving succeeds in killing several Guardians, the Green Lanterns even destroying the Central Power Battery. However, Hal Jordan, the greatest GL rallies the force. Together, they manage to stop Krona and send him back to the realm of the dead.

In JLA/Avengers, Krona threatens the Omniverse. Dangerously, his quest takes him to the Marvel Universe. There, he engages in a game with the Grandmaster. The JLA and the Avengers must gather items of power for Grandmaster and Krona. And the winner must either claim the items or seek the answer of the beginning from Galactus. When the JLA wins the contest 7-5, Grandmaster wins. Though he collects the items of power, Krona betrays him.

By force, he summons Galactus and beats him in order to discover the secret. In the Marvel Universe, only Galan has survived the destruction of the previous universe. In a cosmic egg, he is shaped by Phoenix into Galactus during the birth of the Earth-616 universe. Ultimately, the heroes band together and triumph. In the end, Krona is transformed into a cosmic egg destined to create a new universe.