In a new featurette for Joker: Folie à Deux, director Todd Philips and stars Lady Gaga and Joaquin Phoneix discuss Gaga's role in the film. "She easily slipped into that world. It's not like she's trying to be Harley Quinn from the comic books. She's Lee in this world," Phillips shared.

Folie á Deux is the upcoming sequel to 2019's Joker that will be released in United States theaters this October. The film sees Joaquin Phoenix reprise his role as Arthur Fleck, while Lady Gaga is playing Harley Quinn.

Folie à Deux, the musical sequel to the 2019 film. The studio has also announced that tickets are now on sale for the film, which hits theaters and IMAX on October 4.

The Joker and his Harley Quinn are sticking together until they end, and that sentiment is clear in a new teaser clip for Joker: Folie à Deux that was released by IMDb on Wednesday (Sept. 18). In the minute-long clip,

That certainly looks to be the idea in the latest trailer for Todd Phillips all-singing, all-dancing movie with music Joker: Folie À Deux, which sees Joaquin Phoenix's Arthur Fleck taking to the stand as he goes on trial for the televised killing of Murray Franklin (Robert De Niro) in Joker.

Joker: Folie à Deux. The 60-second video features Lady Gaga's Harley Quinn visiting an emaciated Arthur Fleck, or Joker, played by Joaquin Phoenix, who is in a mental institution. Before she leaves, she pulls out a red lipstick and smears a clownish grin,

Lady Gaga is already making naysayers eat their words with just the teaser of Harley Quinn in Joker: Folie à Deux.