Joker: Folie à Deux is a 2024 American jukebox musical legal drama film directed by Todd Phillips from a screenplay he co-wrote with Scott Silver. Based on DC Comics characters, it is the sequel to Joker (2019). Joaquin Phoenix stars as Arthur Fleck / Joker, reprising his role from the first film, alongside Lady Gaga as Harleen "Lee" Quinzel. The main cast includes Brendan Gleeson, Catherine Keener and Zazie Beetz, with supporting appearances from Steve Coogan, Harry Lawtey, Leigh Gill and Connor Storrie. In the film, while awaiting trial for his crimes at Arkham State Hospital, Arthur develops a romantic relationship with fellow inmate Lee. As the trial begins, he questions his path when he realizes Lee and others only see him as Joker.