A recently deceased police officer and gamer is being determined his soul's fate, when the Grim Reaper gives him a unique opportunity to play for his life.

Yellowstone has erupted, and with it the world has quickly become an inhospitable planet of fire and brimstone. As the lava and fire slowly, but surely, takes control of the land and water, humanity must quickly leave Earth. But as they do so, they construct various machines used to fight the blaze as they evacuate. One of them is the Hellspawn. This is its story.

Robots are specially designed for their bodies, depending on what role they serve. But what happens when two robots, a soldier and a servant, are accidentally given each other's bodies?