The short answer
Joker: Folie à Deux (2024) stars Joaquin Phoenix as Arthur Fleck, the man the public calls Joker, and Lady Gaga as Harleen "Lee" Quinzel. Todd Phillips directed again and co-wrote the script with Scott Silver. Most of the supporting cast is new, but a handful of actors from the 2019 film come back for the sequel.
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If you only remember one name, it is Phoenix. He is in nearly every scene, and the movie lives or dies on whether you follow Arthur through Arkham State Hospital and the courtroom that follows.
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Returning faces
- Joaquin Phoenix as Arthur Fleck / Joker. He won the Oscar for the first film and came back for the sequel.
- Zazie Beetz as Sophie Dumond, the neighbor from Arthur's building. Her role here is smaller and reframed by what the first movie revealed.
- Leigh Gill as Gary Puddles, the former coworker who testifies about what Arthur did to him.
New cast members
- Lady Gaga as Lee Quinzel, an Arkham inmate who pulls Arthur toward music, fantasy, and a version of himself he likes better.
- Brendan Gleeson as Jackie Sullivan, a guard at Arkham who runs his section with a mix of boredom and menace.
- Catherine Keener as Maryanne Stewart, Arthur's lawyer, who wants an insanity plea and a clean narrative.
- Harry Lawtey as Harvey Dent, the assistant district attorney building the case against Arthur.
- Steve Coogan as Paddy Meyers, a television host who interviews Arthur inside the hospital.
- Ken Leung as Dr. Victor Liu, one of the doctors evaluating Arthur.
- Jacob Lofland as Ricky Meline, a young inmate who idolizes Arthur.
- Bill Smitrovich as Judge Herman Rothwax, who presides over the trial.
- Sharon Washington as Debra Kane, a social worker in Arthur's orbit.
Behind the camera
Phillips and Silver wrote the screenplay. Hildur Guðnadóttir returned to compose the score after winning an Oscar for the first film. Lawrence Sher shot it, and the movie leans hard into fantasy numbers that break out of the grey rooms.
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Why the cast matters to the story
The sequel is not a standard comic book chase. It plays as a courtroom drama with musical interludes, and the new actors carry most of the pressure on Arthur. Gaga's Lee is the spark. Gleeson and Keener represent the two ways the world wants to handle him, punishment or treatment. Dent arrives as the future Two-Face, though the film keeps him grounded as a prosecutor rather than a villain.
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So the honest answer to who is in the Joker sequel: Phoenix at the center, Gaga as his counterpart, and a deep bench of character actors filling out Arkham, the court, and the television screen.