"Joker 2" is reported to be a musical, with Joaquin Phoenix once again taking up his iconic role as the Joker. Lady Gaga is also in talks to play the iconic Harley Quinn in the sequel. This will mark the singer's first appearance as a superhero if everything is finalised.

Director Todd Phillips posted a cover of the "Joker: Folie à Deux" screenplay to Instagram on June 7. "Folie à Deux" means a shared delusional disorder. There were speculations that Joker's companion, other than Batman, could only refer to Harley Quinn.

Earlier on, Lady Gaga and Todd Phillips worked together in 2018's "A Star Is Born." The "Poker Face" singer earned an Oscar nomination for best actress and scored an Oscar for an original song from the film.