Warner Bros has released a new teaser for Joker: Folie  Deux, featuring Joaquin Phoenix and Lady Gaga. The clip offers a glimpse of Arthur Fleck's courtroom drama and Lady Gaga's portrayal of Harley Quinn, showcasing her dynamic with the Joker. The teaser, shared on X (formerly Twitter), builds anticipation for the film's release on October 4, 2024.

Francine Maisler, the casting director, praised Gaga's performance, highlighting her ability to match Phoenix's intensity. Although music plays a significant role in the film, director Todd Phillips clarified that it's not a musical; most musical elements exist within Arthur Fleck's imagination.