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Dr. Warren Chapin (Vincent Price) has made a surprising discovery -- the spine-chilling sensation that people get when scared is due to a parasite that he dubs the "tingler." Chapin concludes that in extreme circumstances, prolonged fear can cause the creature to damage a person's spine and even cause death if the victim can't scream, a theory that Oliver Higgins (Philip Coolidge) uses to deadly effect on his wife (Judith Evelyn). Soon the tingler that killed the woman is on the loose. Wikipedia