A pathologist, Dr. Warren Chapin (played by Vincent Price), discovers that the tingling of the spine in states of extreme fear is due to the growth of a tingler—a spinal parasite which can kill the host unless it is destroyed by screaming.“黑魔家族之所以强大，不在于杀人，而在于匿迹。”黑魔呵呵一笑，从怀中取出一本书，轻轻放在桌上：“你们若是真的想冲上上三天，那么，就是遍地敌人，而且，都很强大。躲藏隐形，就成了必修的功法。”