Finally, we get the teaser to the long-anticipated sequel to Joker (no article, please; that's how the film rolls) and it's something. Called Joker: Folie á Deux, the film takes place directly after Joker. We follow Arthur Fleck (played by Joaquin Phoenix), who is getting used to life behind bars. That is, until he sets his sad puppy dog peepers on Harley Quinn (Lady Gaga). Cue the fireworks.

Folie á deux is French for "shared madness" and it's inevitable that Arthur and Harley's fate might mirror that of another pair of loving maniacs (think Mickey and Mallory Knox from Natural Born Killers). What's interesting is that Harley isn't a playing a psychologist. Rather, from the teaser, it looks like she's a fellow patient at the asylum—wait, do people still say "asylum"? And it looks to have a lot of dancing and singing. In several sequences of a burst of colours and song, the cinematography is reminiscent of the musicals of the '60s.

Director Todd Philips, who is known for his The Hangover trilogy, Joker and his cameo in Old School that we will always bring up (see gif for reference), says in an interview at CinemaCon that this isn't a musical but "it’s a film where music is an essential element." He then adds that, "it’ll make sense when [we] see it." We are guessing, dream sequences that only Arthur and Haryley are privy to.

Other actors appearing in the sequel includes Zazie Beetz reprising the role of Arthur's former love interest; Leigh Gill returns as Arthur's clown coworker as well as Sharon Washington, Arthur's social worker. Seeing as how Robert De Niro's character ended up in the last instalment, we can rule out his appearance. Unless he appears in Arthur's imagination or something.

Joker: Folie á Deux is scheduled for theatres 4 October