The countdown to the end of the world has begun. That's what apocalypse preppers believe. Until now, they have been dismissed as cranks and crazies, but what if those preppers are right? A growing body of scientists are beginning to agree with them. Horrifyingly, experts admit that an apocalyptic event is not only likely, but imminent. This investigation uncovers the shocking reality of their predictions by exploring three ways an apocalypse could play out.