蝴蝶效应3A demonic cult has summoned the ultimate beast, Bigfoot, to prowl the mountains and slaughter innocent victims. But when Claude is attacked by the creature, the curse of Bigfoot is passed down to him. Now Claude turns into a hairy, fanged beast at night, thirsty for warm blood. Only the power of a nun trained in exorcism can hope to set Claude free from this nightmare. But it may already be too late.