In the DC Comics fictional shared Universe, Apokolips is the planet ruled by Darkseid, established in Jack Kirby's Fourth World series. It is also integral to many DC Comics stories. The planet is considered the opposite of New Genesis.
Apokolips (a play on the term "apocalypse") is a large planet. It is an ecumenopolis with burning firepits. The war that destroyed the Old Gods and created New Genesis and Apokolips separated the Fourth World from the rest of the universe, leaving it only accessible by Boom Tube.
Apokolips and its bright counterpart, New Genesis, were spawned by the destruction of Urgrund the world of the "Old Gods" (initially implied to be the gods of classical mythology, though versions of these characters have since been revealed to still exist in the DC Universe). Apokolips and New Genesis are locked in an eternal war, symbolizing the struggle of evil and good on a grand mythic scale. Apokolips is ruled by a fell being known as Darkseid, a dark leader who rules over his downtrodden people by force and fear. Apokolips appears to be a high tech industrial wasteland.
Both Apokolips and New Genesis were seemingly destroyed in a final battle prior to Grant Morrison's miniseries Seven Soldiers: Mister Miracle. However, the final issue of that series implied that the story's earlier events were merely visions seen by the hero as part of an elaborate test by the New God Metron. How much of the battle really happened and the current status of the New Gods remains to be seen.
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