Monsters are everywhere these days, and paradoxically by the start of the third millennium, belief in their existence seems to be even stronger. For many, in the age of satellites and the internet, the presence of these fantastic creatures should have disappeared... but there are those who are willing to find evidence to support their opinions. The belief in monsters is found, although at different levels, in all cultures of the world. What changes is only the nature of the beings that haunt the nightmares of humanity. If less than a millennium ago it was still possible to swear that fairies existed, today such a conception seems extravagant. This is because scientific knowledge was added that provided answers to inexplicable facts, but, as in other cases, new doors were opened for debate. This is the case of zombies and vampires, who have been present for centuries in cultural traditions; full of fantasies and truths; but in the scientific light, they can have explanations, that do not finish calming the human. Thus, the window is open for future research. This book is a guide to understanding the zombie and vampiristic phenomenon, providing facts, and clarifying concepts, and the reader will need a valuable contribution to their knowledge.