London of the 1830s was terrorized by an astonishing figure—a caped man with long sharp metallic claws who spouted blue fire from his mouth and leaped over rooftops. Surely such a creature could be no more than myth, right? Or was there a mysterious aristocrat playing tricks on the working class? In this week’s episode of MonsterTalk, we talk with historian Mike Dash about the legendary figure known as Spring Heeled Jack.