Joaquin Phoenix and Lady Gaga star in 'Joker: Folie à Deux' sequel trailer

The much-awaited Joker: Folie à Deux, the sequel to Joker, starring Joaquin Phoenix and Lady Gaga, is set to release on October 4. This musical continuation explores the intertwined mental struggles of the Joker and Harley Quinn, presenting a fresh take on their complex and chaotic dynamic. With a star-studded cast including Zazie Beetz, Brendan Gleeson, and Catherine Keener, the film promises an engaging new chapter. While plot specifics are scarce, it's confirmed to be a musical, fitting given Lady Gaga's musical background. The title, Folie à Deux, suggests an exploration of shared mental illness between the characters.