Warner Bros. shared the full-length trailer for the upcoming film Joker: Folie à Deux, featuring Joaquin Phoenix and Lady Gaga. Joker: Folie à Deux is a sequel to the 2019 film Joker, inspired by DC Comics characters and  co-written and directed by Todd Phillips.

Phoenix reprises his role as Arthur Fleck (aka Joker) while Lady Gaga has joined the cast as Harleen Quinzel, aka Harley Quinn. An official film synopsis reads: “‘Joker: Folie à Deux’ finds Arthur Fleck institutionalized at Arkham awaiting trial for his crimes as Joker. While struggling with his dual identity, Arthur not only stumbles upon true love, but also finds the music that’s always been inside him.”

The trailer shows Joker (Phoenix) and Harley Quinn (Gaga) connect at Arkham Asylum and cause chaos in Gotham City. Brendan Gleeson, Catherine Keener and Zazie Beetz also star.

Joker: Folie à Deux opens in theaters Oct. 4; check out the trailer: here.

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