JOKER: FOLIE À DEUX, directed by Todd Phillips and starring Joaquin Phoenix and Lady Gaga, follows Arthur Fleck/Joker as he navigates his dual identity while awaiting trial at Arkham. The film explores Arthur's discovery of love and music within himself, with a cast including Brendan Gleeson, Catherine Keener, and Zazie Beetz. Phillips and Scott Silver co-wrote the screenplay based on DC characters, with Lady Gaga serving as music consultant. The film was produced by Phillips, Emma Tillinger Koskoff, and Joseph Garner, with a team of executive producers.