S6, E24: The Gaslight Ghoul, a Victorian mass murderer similar to Jack the Ripper, strikes again a century later. In a fog-shrouded London, the Ghoul is intent on assassinating all the foreign delegates attending the international disarmament conference. Steed invents a fictitious additional Gaslight Ghoul murder in order to investigate a Gentlemen’s Club, dedicated to uncovering the identity of the Ghoul, which Steed suspects is involved in the new killings.