“Joker: Folie à Deux” picks up with Arthur Fleck ( Joaquin Phoenix ), institutionalized at Arkham Asylum, awaiting trial for his violent crimes. As he grapples with his fractured identity, Arthur finds love with fellow inmate Lee (Gaga) and begins embracing the music that has always played inside his chaotic mind.

Let's get the elephant-in-clown-makeup in the room out of the way first: Arthur dies at the end of Joker: Folie a Deux, meaning a third movie following the titular clown is very unlikely, if not impossible (unless they decide to go full surreal dream sequence on his deathbed, or a similarly 'out there' premise).

In Joker: Folie à Deux, Lady Gaga stars as Harley Quinn opposite Joaquin Phoenix’s Arthur Fleck/Joker. The film—which is part jukebox musical and part crime drama—is the sequel to the 2019 blockbuster hit Joker, which earned Phoenix a Best Actor Oscar.