The story would have followed a man turned into a zombie via exposure to experimental chemicals from a laboratory into which he had broken.
Retaining his intelligence, he sets out on a mission to destroy the Prometheus Corporation which made the chemicals.
To do this, he amasses a vast number of zombie warriors to take control of the futuristic Restoration City, headquarters of the shadowy Prometheus Corporation.
The game was designed primarily as a real-time strategy title, wherein the player commanded their zombie army directly and makes tactical use of special unit types to achieve objectives.
In a 2019 retrospective interview with Volatile Games' co-founder about the development of Reservoir Dogs, he revealed that Possession was originally pitched to Bandai Namco but they refused to fund it due to it being "very expensive".