When Lucifer is your brother, all hell can break loose. The ex-archangel Gabriel, now living in Riverside, California, struggles to find his new normal. However, a surprise visit from his older brother, Michael, brings disturbing news. There's a key to the backdoor of hell and if their errant brother, Lucifer, finds it, he'll unleash a horde of blood-thirsty zombies on humanity. Zombies? Seriously? Can Gabriel not get through his...