Set in the Millarworld, the series follows Queen Emporia, Empress of the Royal Empire that ruled Earth 65 million years ago, as she decides to leave her husband King Morax along with their three children.

[16][17] In December 2023, it was revealed that Millar had signed a deal for Dark Horse Comics to become the new publisher of the Millarworld titles, including a new volume of Empress, serving as a direct sequel following the publication of an omnibus.

[21] Facing off against a new fleet of security sent by King Morax, willing to stop at nothing to get the boss' children back, Emporia and Dane must battle intergalactic beasts at every turn as they teleport between alien war zones and dead worlds in evading the forces pursuing them.

[22] Stranded on barren planet Golgoth without hope of escape, shrouded by a massive dust cloud, when two passing scrap-merchants think they can make a quick profit by selling Emporia's children as slaves, unaware of who they are, the family is torn apart again and left fighting for their lives.

Embedded within her new-age sanctuary, Dane and Emporia decide to enjoy each other's company, secretly observed by Aine, who outraged, contacts her father and brings him to the planet.

[37] In August 2017, Netflix acquired Millar's comic book publishing company Millarworld, and by the following July 2018, announced it had green-lit several adaptations of his works, including Empress, now to be written by Lindsey Beer,[38] before the project entered development hell.