Controversial Joker movie lands US release date. Lady Gaga seen as Harley Quinn for Joker 2. ©2024 Hearst UK is the trading name of the National Magazine Company Ltd, 30 Panton Street One of the more basic theories that fans have for "Joker: Folie à Deux" is that the movie could be a straightforward adaptation of a popular story featuring Joker and Harley Quinn. Redditor u The upcoming Joker: Folie à Deux project will serve as a sequel to the much-acclaimed 2019 Joker film loosely based on the DC comics character and prominent Batman villain of the same name. The UsEs4V.