[...] some astute fans also noticed the sound of the Joker predecessor Jerome's (Cameron Monaghan) laugh while the Indian Hill patients were escaping into the night. Was it really Jerome escaping from Indian Hill, giving hope to the theory that Gotham's fan favorite villain will rise again? [...] the rise of the Joker mythology in the tail end of Season 3 will become a major storyline for Season 4, as fellow executive producer John Stephens confirmed during the Television Critics Association fall previews.