For a quarter of a century, supernatural entities from various corners of the world and alternate realms have fallen victim to abductions. The Facility has incarcerated them, subjecting them to experimental procedures that involve the fusion of their genetic material, all in pursuit of crafting a formidable super-soldier.
However, a decade ago, Pandora, their greatest accomplishment, managed to break free along with a substantial assembly of fellow captives. Today, these escapees have rallied the formidable Elite Warriors hailing from the depths of the Underworld. Their mission: to obliterate the mastermind responsible for these heinous acts before he can succeed in engineering a new iteration of Pandora.
Elijah Alexander, the resolute general of the Underworld's formidable demon army, commands his elite warriors on a mission to Earth. Their paramount objective is the protection of their monarch's daughter, the former Princess Calah, now living under the guise of Kya Gilham. Twenty-five years ago, during an incursion into the Underworld, Kya was placed under the guardianship of the Gilham family. Tragically, the recent demise of her surrogate parents has left the princess exposed to danger.
As the warriors and Kya make the Gilham residence their operational base, unsettling suspicions take root. The deaths of the Gilhams appear increasingly suspicious, suggesting foul play. Determined to unveil the truth, the Elite Warriors embark on a quest to unearth the mystery behind these murders.
Upon their arrival at Kya's family home, an enigmatic entity makes herself known to the warriors. Kya asserts that this presence has been with her since childhood. However, Roman, one of the warriors, senses that there's more to this entity and the Gilham house than meets the eye.
This entity eventually reveals her true identity as Raven, a former prisoner of the prison known only as "The Facility." She offers her assistance in uncovering the truth, explaining that she and her people require help. The warriors begin to unearth the disturbing secrets contained within computer files, revealing a history of scientists conducting experiments on demons, vampires, shapeshifters, angels, and others. The experiments encompassed years of physical and psychological abuse, targeting individuals of all ages, with the aim of creating a super-soldier, a powerful weapon named Pandora.
Raven guides them to the truth, never revealing too much, through the grim history of The Facility. Frustration mounts as the warriors tire of her cat-and-mouse game. Raven's people yearn for retribution, seeking to dismantle the mastermind responsible for these atrocities, for which they need the support of the Elite Warriors from the Underworld. So, Raven finally discloses that she has some of their people who went missing during the Underworld's assault twenty-five years ago, forming an indisputable union for their help now. She proposes to lead them to her home, where hundreds of former Facility residents now reside in peace.
While Elijah remains wary of Raven and her motives, he acknowledges the necessity of following her lead for the sake of their people and their princess. Unbeknownst to him, the situation is destined to worsen before it can improve.