Victorian-era folkloric attacker who leapt impossible distances, breathed blue flame, and terrorised London for decades. Likely several copycats; never identified.
From Wikipedia
Spring-heeled Jack was an entity in English folklore of the Victorian era. The first claimed sighting of Spring-heeled Jack was in 1837. Later sightings were reported all over the United Kingdom and were especially prevalent in suburban London, the Midlands and Scotland.