In 2019, a year now separated from us by enough catastrophic global events to feel like a remote archaeological era, the movie Joker, like it or not (I certainly didn’t), was a big deal. It won the Golden Lion at the Venice Film Festival and later garnered a leading 11 Oscar nominations, including Best Picture, with star Joaquin Phoenix eventually winning Best Actor for his performance as a mentally ill would-be stand-up comic turned murderous clown. The movie also became the subject of heated discussion and not a little hand-wringing. Would its portrait of the comic-book villain as the lonely, misunderstood victim of mistreatment by a vaguely defined “society” inspire copycat acts of mayhem? Joker may have teetered uneasily in the balance between critiquing incel violence and being a commercial for it, but thankfully its many admirers kept their enthusiasm contained to the box office, where the film raked in over a billion dollars worldwide, shattering the all-time record for an R-rated movie.

Five years later, Joker’s director and co-writer Todd Phillips has returned with a sequel that swerves in an unseen—and on paper, intriguing—new direction: Our miserable antihero has become, of all things, the singing, dancing protagonist in his own private musical. A lot of things could be said about Phillips’ execution of that idea, most of them deservedly negative. By any reasonable measure this is a terrible movie, too long and too self-serious and way too dramatically inert, a regrettable waste of its lead actors’ boundless commitment to even their most thinly written roles. But no one could accuse Joker: Folie à Deux of being a mere cash grab, lazily recycling its predecessor’s mood, themes, or plot structure.

There’s an admirable boldness to Phillips’ decision to cast a pop supernova like Lady Gaga opposite the darkly charismatic Phoenix, then ask them both to sing, live-to-film, a jukebox-musical soundtrack of more than a dozen well-known songs that range from 1940s Broadway standards (“Bewitched, Bothered and Bewildered,” from Pal Joey) to 1970s easy-listening pop (the Carpenters’ “Close to You”). Granted, the director fails to clear the bar he sets for himself—fails hard enough, at times, to scrape the skin off his legs from knee to ankle—but it’s fair to say that this movie’s problems have little if anything to do with the attempted magic trick of its premise. It’s mainly the weirdness of that trick, and the stars’ doomed dedication to pulling it off, that renders Joker: Folie à Deux even minimally watchable.

Joker ended with Phoenix’s Arthur Fleck locked up in a mental institution but seemingly on the verge of escaping to start his career as Batman’s archnemesis. Instead, Folie à Deux finds Arthur still locked up in Gotham City’s inhumane Arkham State Hospital. Having been judged competent in a sanity hearing, Arthur is about to go on trial for the murders of five people, one of them on live television. (As he confesses to more people than he probably should, the number is really six if you include his mother.) Outside the institution’s grimy walls, he has become a folk hero to a certain set of clown-mask-sporting nihilists and a tabloid bogeyman to the public at large. But inside the hospital, Arthur remains a pitiable loser, mocked by his fellow inmates and singled out for alternately friendly and cruel treatment by an Irish prison guard (Brendan Gleeson).

Phillips’ desire to mess with the audience’s genre expectations is evident from the jump. The first thing the audience sees, after a vintage WB logo, is a cartoon short entitled “Me and My Shadow,” animated by the Triplets of Belleville filmmaker Sylvain Chomet in a style reminiscent of classic Looney Tunes. In it, Arthur’s shadow self emerges from his body to commit crimes that the real man is then blamed for. The plot of the cartoon is a literalization of the defense that his sympathetic lawyer (Catherine Keener) will later use in court: Arthur, she believes, is the victim of dissociative identity disorder, a former abused child who’s made up the Joker character as a way to vent his otherwise inaccessible rage. It’s not clear whether the movie wants us to agree with her assessment or with that of Gotham assistant district attorney Harvey Dent (Industry’s Harry Lawtey), who thinks Arthur is merely a sociopath faking mental illness in order to escape the consequences he deserves.

Meanwhile, Lee Quinzel (Gaga), an arsonist serving time in Arkham’s minimum-security wing, has a very different vision of the Joker: She’s a groupie, having followed his crime spree in the news and obsessively rewatched a TV biopic about him. (Even fans who haven’t consumed the aggressive marketing won’t take long to recognize her as the future Harley Quinn.) When they’re put in the same music-therapy group—a place where cheery sing-alongs are touted as a wholesome counterpoint to the grimness of asylum life—Lee and Arthur bond instantly and soon develop their own more twisted motives for bursting into song. When they’re together, or apart and thinking of each other, their internal monologues bubble to the surface as ready-made classics of the American songbook. This despite the fact that Lee, for her part, seems not to be a big fan of the musical genre. When the asylum shows the MGM classic The Band Wagon on movie night, Lee gets so bored she sets fire to the rec-room piano. Not liking The Band Wagon should surely serve as a red flag for any prospective suitor, but Lee redeems her taste later on, when the by-then-besotted couple belts out a cover of that musical’s most enduring number, “That’s Entertainment.”

Joker: Folie à Deux is hardly the first musical to posit the idea of its song-and-dance sequences as the emanations of a delusional mind, but it must be among the ones that hammer hardest on that conceit. In scene after scene, often with hardly a break for dialogue in between, either Lee, Arthur, or both in unison will channel the intensity of an emotional moment by delivering a breathy version of some beloved pop hit or other. Invisible string orchestras may swoop in to accompany these flights of fancy, just as they would in a Hollywood musical, but the secondary characters never join in and seldom seem to notice that a serenade is taking place. With rare exceptions (like the rock-’em-sock-’em Gaga cover of “That’s Life” that plays under the closing credits), most of the vocal performances in Folie à Deux are purposely underwhelming in terms of virtuosity: They’re husky, scratchy, and in Phoenix’s case often half-spoken, suited more for a tipsy karaoke night than for the Broadway stage.

Gaga has pointed out in interviews that neither her nor Phoenix’s character is a professional entertainer, so why should they sing like one? It’s a reasonable point, as is a less polite one she doesn’t make: that if she sang full-out instead of curbing her usual vocal splendor, the contrast would place Phoenix’s adequate but limited baritone in unflattering relief. But what makes the songs, irresistible toe-tappers all, start to blur into a drab wall of sound has less to do with the performance quality than with the nonstop onslaught of musical numbers and the sluggishness of the story in between. Other than the building of internal emotion to the point that it must express itself in song—over and over and over—precious little happens in Folie à Deux. Arthur is declared fit to stand trial, goes to court, and is marched back by the cruel guards each night to the bleakness of his cell. A few familiar characters from the first Joker, including Zazie Beetz as Arthur’s former neighbor, show up to take the stand, and at one point a horrific act of violence interrupts the proceedings. But the forward motion of the story is so minimal, and so broken up by long stretches of musical stasis, that the result barely feels like a movie. It’s more like a work of Joker fanfic, created not just by the credited screenwriters (Phillips and Scott Silver, who also co-wrote the 2019 film) but by Phoenix and Gaga themselves in what was apparently a collaborative project to revise the script in real time during the shoot.

The fact that Folie à Deux has the self-referential quality of fanfic does not necessarily mean it will go down well with actual Joker fans, who seem likely to come out scratching their heads over a sequel about a comic-book supervillain that contains virtually no fight scenes, a single car chase that ends roughly a minute after it begins, and scarcely a moment that could be classified as suspenseful. The main question to be answered by the viewer is not “What will happen next?” but “Is all this taking place in the real world, or just inside their heads?”—an epistemological puzzle that is not enough in itself to sustain our energy for nearly two hours and 20 minutes. Even more confoundingly, all this time spent locked in the psyches of two deeply disturbed characters gives us little insight into their motivations. The pathetic Arthur Fleck remains, as I called him in my review of the 2019 movie, a “poor little clownsie-wownsie,” while Gaga’s Lee is so underwritten we remain unsure to the end whether she is a vulnerable fangirl or a heartless femme fatale. If he is, as the lyric from “That’s Entertainment” goes, “the clown with his pants falling down,” does that make her simply “the skirt who is doing him dirt”? To make Gaga’s character little more than a mirror that reflects the Joker back to himself (in alternately flattering and unflattering ways) is a real squandering of this powerhouse performer, whose life experience as a stadium-filling superstar has given her no shortage of insight into the psychology of fame monsters.

Without spoiling the ending, it’s safe to say that with it, Phillips seems to foreclose the likelihood that anyone will be begging for more. That’s probably a blessing for both the filmmaker and us, since this somber, muddled, maudlin film seems to have been made by someone who holds his characters and his audience in contempt.