Joker 2 finally reveals Lady Gaga's role as Harley Quinn in leaked photos and videos from the film set in New York. The highly anticipated sequel is rumored to be a musical, with Gaga singing Fred Astaire and Judy Garland tunes. Director Todd Phillips plans to explore the origins of the Joker-Harley partnership or retell Harley's origin story in a brighter, more fanciful Gotham City. The movie will be a DC Elseworlds project outside the DC Cinematic Universe, featuring returning and new cast members like Brandon Gleason and Katherine Keener.