Welcome to the world of Joker: Folie à Deux. The sequel to the Joaquin Phoenix-led film will bring you to the latest story of the Batman villain, legally known as Arthur Fleck. The second film will introduce Lady Gaga as Harley Quinn, the lover and crime tag team partner of The Joker, who will run wild throughout Gotham City. What’s different in this film is that there is a heavy outpouring of music and dance in the film. You can see the trailer below.