A contest got the designers of Mr. Jack 137 ideas for new characters. Out of those 137 two were chosen: - Steve McKeogh's “Spring-Heeled Man” who can jump over other people or obstacles - Arnaud Fillon's “Abberline”, an inspector The expansion contains these 2 new characters and 3 others designed by Bruno Cathala and Ludovic Maublanc: - John Pizer, a butcher who frightens everyone - Joseph Lane, an anarchist who builds barricades - Madame, who can move fast, but won't enter the sewers Furthermore, the expansion contains rules for a new way to set up the game.