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) and stars Joaquin Phoenix reprising his role as Arthur Fleck / Joker, alongside Lady Gaga as Harley "Lee" Quinzel. The supporting cast includes Brendan Gleeson, Catherine Keener, Zazie Beetz, Steve Coogan, Harry Lawtey, and Leigh Gill. In the film, Arthur awaits trial for his crimes at Arkham State Hospital where he develops a romantic relationship with another inmate.