Lady Gaga's Harley Quinn Meets Joaquin Phoenix's Joker in “Folie à Deux” Trailer

At CinemaCon 2024, a first glimpse at the sequel to the Joaquin Phoenix-starring ‘Joker’ was revealed

Dr. Harleen Quinzel will see you now.

Lady Gaga lights up the screen as Harley Quinn in Joker: Folie à Deux, the upcoming musical sequel to Todd Phillips' Oscar-winning 2019 film Joker. Appearing alongside Joaquin Phoenix as the titular Batman villain, Gaga shows off her take on the popular DC Comics character in the new movie's first trailer, revealed April 9 at CinemaCon in Las Vegas.

Phillips, 53, took the stage at Caesars Palace to introduce the movie's first trailer. In it, Harley can be seen in what appears to be an insane asylum, greeting Phoenix’s Arthur Fleck. “Do you want to get out of here?” she asks him, before the two can be seen dancing in a fantastical musical sequence.

Phoenix can be heard saying, “I’ll tell you what’s changed. I’m not alone anymore. That’s what we should be talking about!”

Related: Zazie Beetz Praises 'Joker' Sequel Costar Lady Gaga as 'Very Grounded' on Set: 'She’s Just Stefani'

At one point later in the trailer, Gaga as Harley says, “I want to see the real you,” drawing a smiley face with lipstick on the glass wall that separates them. The Joker smiles.

Gaga, 38, confirmed her casting news in August 2022, posting an animated teaser video that showed her and Phoenix's silhouettes dancing to old-timey music. Along with the film's official title ("folie à deux" is French for "folly of two" and refers to shared psychosis or delusion), the Oscar-winning songwriter shared the release date: Oct. 4, 2024. Phillips has returned to direct the sequel, and co-wrote the screenplay with Scott Silver.

To celebrate Valentine's Day 2023, Warner Bros. released the official first-look image of Gaga and Phoenix, 49, in Joker: Folie à Deux. Phillips marked the end of filming on Instagram in April 2023 and has semi-frequently shared first looks at the upcoming movie on the social media platform since, including again on Valentine's Day this past February.

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Both Gaga and the writer-director shared the movie's poster for the first time on April 2, with Gaga writing, "The world is a stage," along with the poster, which shows her character and Phoenix's Joker dancing together in their signature clown makeup.

In the DC comics, Harley is Joker's longtime hench-woman and love interest whom the sinister prankster first meets when she served as his psychiatrist at Gotham City's Arkham Asylum. The character was first created for the acclaimed 1992 Saturday morning cartoon Batman: The Animated Series and quickly became a fan favorite, jumping from the TV screen to comic-book pages.

Margot Robbie brought the role to the big screen, playing Harley in 2016's Suicide Squad and 2021's The Suicide Squad, as well as the character's own spinoff movie, Birds of Prey, in 2020. In January 2024, Robbie, 33, told Variety that she always imagined the character "would get passed on to other actresses to play, the way there are so many iconic male characters."

"That was always the dream for her," she said at the time. "Harley’s so fun and can go in so many different directions. You put her in someone else’s hands, and it’s like, 'What are they going to do with her?' The options are endless."

Joker: Folie à Deux is in theaters Oct. 4.

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