But in 2019, Joker was given a movie of his own starring Joaquin Phoenix as the title character and no Caped Crusader in sight a.k.a. Harley Quinn. This will make Gaga the second actress to With Todd Philips working on a Joker musical sequel, Lady Gaga is reportedly in talks to play Harley Quinn. While this news may entail that Arthur Fleck has a love interest to follow the comics, the movie could also take a different route, introducing her as the black-and-scarlet supervillain. This year's The Batman saw the Caped Crusader The announcement that Lady Gaga would be joining Joker: Folie à Deux's cast made waves, especially with her character being the movie's answer to Harley Quinn. Official details about her role are yet to be revealed, although a recent rumor claimed the movie will be taking a different route with the character. MGeyM3.