Spring-Heeled Jack: The Terror of London (1863) is the first full-length serial novel featuring one of Victorian Britain's most notorious urban legends. First published as a penny dreadful in 1863 and reprinted in 1867, this extraordinary narrative transformed Spring-Heeled Jack from whispered terror and theatrical villain into a fully realised Gothic anti-hero. Leaping from the gaslit streets of London and the fevered imagination of the nineteenth century, Spring-Heeled Jack is both trickster and vigilante: a masked aristocrat who prowls the city after dark, terrifying wrongdoers and rescuing the vulnerable. With his phosphorescent fire, devilish mask, and extraordinary ability to leap great distances, Jack is the archetype of the modern costumed avenger - a figure who sits somewhere between folklore, Gothic fiction, and the earliest roots of the superhero tradition. This new critical edition, edited by J. S. Mackley, presents the complete text of the 1863 serial novel for the first time in modern print. The volume also includes a substantial introductory essay that explores the legend's folkloric origins, its links to aristocratic scandal, theatrical spectacle, and the sensationalist penny press. Both a thrilling Victorian narrative and a cultural artefact of enduring significance, Spring-Heeled Jack: The Terror of London offers modern readers a rare glimpse into the dark imagination of nineteenth-century Britain - and restores one of its most infamous legends to its full original form.