Joaquin Phoenix is back as Arthur Fleck aka The Joker in October for Joker: Folie à Deux, where he meets his match in Lady Gaga’s Harley Quinn. Sentenced to Arkham Asylum following the events of the first movie, Arthur meets Harley and his world turns into a twisted musical. The movie will apparently feature several musical numbers and director Todd Phillips is back to direct. Zazie Beetz, Leigh Gill, and Sharon Washington reprise their roles from Joker and Brendan Gleeson, Catherine Keener, Jacob Lofland, Steve Coogan, Ken Leung, and Harry Lawtey join the cast. Joker: Folie à Deux is out on October 4th this year and you can watch the trailer below.