Three years of peace transpired after Rilk defeated the Dark Lord Vanko, but while Mary was a genuine double-agent who wanted to make Rilk, her surrogate little brother, strong enough to defeat Vanko, Marvin was actually a triple-agent who agreed with Vanko's ideals the entire time. With a forbidden spell that he learned from Vanko before his death, Marvin absorbs enough demons in Hell to become Satan, the Devil himself. The spell triggers a magical prison to release the Eternal Shadow, an ancient, primordial being who co-created the Laws of Magic, and had roamed the universe for billions of years before his entrapment. While the Devil Marvin launches a genocide against the autistic community, the population that Rilk himself is a member of, the Shadow has his own plans. Regardless of whether or not Marvin freed the Shadow from his prison, the Shadow has always foreseen the day when he would meet the descendants of Genghis Khan in a martial arts battle to decide the fate of the universe. Currently, the Shadow's destined opponents are Victor Chang and Angela Blue, and it just so happens that Victor's autistic brother, Colin, is one of the victims of Marvin's genocide. So reluctantly, Marvin and the Shadow have aligned their agendas together. Once again, the fate of the Earth is in the hands of the World Saviors as they embark on an adventure through Heaven, and attempt to prevent the first stage of Marvin's diabolical plans.