After young guitarist Todd comes across a new drug with mind-blowing effects, he quickly learns that the world is on the brink of destruction.

Terrifying side effects of the psychedelic drug, Ash, are turning its users into the living dead. A plague is quickly infecting the entire world, leaving Todd and his estranged brother, Mitch, to band together.

But even with the brothers' lives hanging in the balance, can they set aside their differences and survive the impending apocalypse together?