Folie à Deux, Lady Gaga‘s Harley Quinn tells Joaquin Phoenix's Arthur Fleck, "You can do anything you want" - which probably isn't the best thing to say to someone with an unpredictable neurological disorder who's currently institutionalized for committing several murders.

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.

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,

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.

Lady Gaga recently shared the movie's final trailer, and she sounds absolutely incredible singing "That's Life" in it. What we know about Joker: Folie à Deux is limited, but that'll change when it hits theaters in October.

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,

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.

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