Joker: Folie à Deux is an upcoming American musical thriller film directed by Todd Phillips and written by Phillips and Scott Silver. It serves as the sequel to the critically acclaimed Joker (2019), and stars Joaquin Phoenix returning as Arthur Fleck, also known as the Joker. The film also features Lady Gaga as Harley Quinn and Zazie Beetz reprising her role. Produced by Warner Bros. Pictures, DC Studios, and other production companies, the movie was filmed in various locations, including Los Angeles and New York. Joker: Folie à Deux is set to be released in the United States on October 4, 2024.