The Shameless actor guest-starred on Gotham in its inaugural season, playing Jerome, a character that was not necessarily the Joker, but certainly “the beginning of the Joker saga,” as showrunner Bruno Heller told People back in February. “People will have to watch in the long run to see where this character goes and whether he is the Joker or not, but the whole show is about origin stories, and origins can be very complex and convoluted things.”