Joker 2: Folie À Deux, a forthcoming musical film from Warner Bros., will star Lady Gaga alongside Joaquin Phoenix reprising his legendary role as Arthur Fleck. The title’s significance and what it portends for the sequel, however, are still up for debate.

With Warner Bros. announcing its release in 2024, the eagerly anticipated sequel to Joaquin Phoenix’s Arthur Fleck has now been given a name that suits what the musical film would entail: Joker 2: Folie À Deux.
The singer-actress Lady Gaga, who is set to play Harley Quinn Harleen Quinzel, will join Joaquin Phoenix in the film Joker 2: Folie À Deux, which will feature many sequences set in Arkham Asylum.
The phrase “folly of two” or “madness of two” is a French expression that is used in the movie’s title, Joker 2: Folie À Deux. Folie à Deux is a rare psychological illness also known as a shared delusion disease.
Two persons who are close to one another and who have the same illusion are said to have folie à deux. The individual with greater authority among the two introduces the delusion, and this seeps into the other person’s mind.
In the comics, Harleen Quinzel and the Joker had a similar encounter when they persuaded her to aid in his asylum breakout and she transformed into Harley Quinn to serve the Joker’s purposes.
Given Harley Quinn’s role in the film and the fact that Joker 2: Folie Deux will likely be a musical, viewers may anticipate a waltz-like plot from both Joaquin Phoenix and Lady Gaga.
On October 4, 2024, Joker 2: Folie À Deux is scheduled for release.