From Mickey 17 and M3gan 2.0 to a musical about the end of the world, this was an eclectic year for science-fiction films. Some ideas are so compelling, so intuitive, one would sooner recycle them than take them apart to explore. So, in 1950, Isaac Asimov fixed up some puzzle stories into a fiendish, Agatha Christie-in-space sci-fi novel, I, Robot, while in 1968, Stanley Kubrick's 2001: A Space Odyssey set a high bar for films about (or at least containing) artificial intelligence. There, ideas-wise, the story of robots in cinema pretty much starts to repeat on an endless loop. This year, The Electric State spun a yarn about a robot rebellion, M3gan 2.0 showed you can't keep a good killerbot down and Companion took the femmebot's point of view to give us a decent adult-themed Asimov pastiche. All three toyed with the usual notions around free will and indulged in handwringing about when to treat a machine like a person.

The taglines on M3GAN 2.0 posters read like text messages from an overconfident tween: "HEY, QUEENS." "MISS ME?" "I'M STILL THAT B." (Another that apparently exists, though I haven't seen in the wild, hilariously reads: "THIS BITCH.") Next to them, the titular robot who looks like an uncanny-valley Olsen twin peers from above circular sunglasses. This character that, per her 2023 film debut, will kill you and your little dog, too, is now being marketed with big child-star energy. While she always had more to offer than malice (her late-movie dance break went viral from its trailer alone), this moment marks a clear pivot on M3GAN's Mary Janes.

As the very first image of devil doll sequel M3gan 2.0 emerges on screen, of a desert with the words "somewhere on the Turkish-Iranian border" popping up like it's a Bond movie, you'd be forgiven for double-checking if you're in the right cinema. The original, a grabby artificial intelligence (AI) riff on Child's Play and Annabelle, was a brisk, by-the-numbers domestic horror, released on the first weekend of 2023, a slot usually given to the very worst genre films. M3gan was smarter than most, often sly and frequently funny and introducing what's now become a rarity, an almost instant non-IP pop culture icon, whose virality exploded the film into a surprise smash (raking in over 180m from a 12m budget). Like the films it was inspired by, a franchise was inevitable although where we're taken in M3gan 2.0 was far less of a given. For the follow-up, writer-director Gerard Johnstone has swerved from horror to action while retaining and tweaking the comedy with a release date that's been upgraded to summer blockbuster territory. It doesn't always work – a two-hour runtime that's a little too long, world-saving stakes that are a little too big, funny lines that are a little too not funny – but it's a mostly watchable second-tier event movie that, in a world of inconsequential sequels that fail to justify their existence, will do.

At least it shows its symptoms clearly: inflammation and swelling. In the first film, Gemma (Allison Williams), a robotics engineer, becomes the guardian to her orphaned niece, Cady (Violet McGraw), and tests a new invention, the titular A.I.-powered robot-doll, on her. Cady grows attached to the responsive doll, which is programmed to protect the child and takes to the mission with a mechanical perfection, slaughtering anyone who expresses hostility--and does so with snarky pride in her absolute power. At its core, though, "M3GAN" (like the sequel, directed by Gerard Johnstone) is a family melodrama centered on Gemma's struggles with parenting and Cady's need to bond--plus the robot's quick embrace of human cruelty. The film's failures are painful because its setup is fruitful.

If you had wandered the set of the film M3gan 2.0 last year, chances are you would have stumbled into M3gan, the terrifying humanoid doll, staring lifelessly while she waited to be called for her next scene. Sometimes she would stand in the corner of the soundstage, says Allison Williams with a nervy laugh. "The dilemma is: do you turn her around so she's facing the wall, or do you let her face the room? In the sequel to the sci-fi horror M3gan, Williams resumes her role as Gemma, a roboticist who has become a crusader against rampant and reckless AI development after her creation – developed for her orphaned niece – became murderous. Acting opposite M3gan was unsettling, says Williams, speaking over a video call from a hotel room in New York. Sometimes she was played by the 15-year-old dancer Amie Donald, but often she was a robotic doll, animated by a small team. "When she's been working for a while, her eyelids can get sticky," says Williams. M3gan's handlers would paint lubricant on to her eyeballs with a brush and Williams would have to catch herself: "She's not flinching and for a second you're like: 'Ugh.' Then you remember: this is not a live thing." Still best known for her first role as Marnie in Lena Dunham's landmark TV series Girls, Williams has gravitated towards comedy-tinged horror in recent years. Her first post-Girls film role was in the Oscar-winning dark comedy horror Get Out. It and M3gan were relatively low-budget projects that became cultural phenomena – Get Out for its commentary on racial politics, M3gan for what it says about the dangers of AI (as well as the uncanniness of M3gan herself). Williams has long been interested in AI – she knows Sam Altman, the co-founder and CEO of OpenAI, which created ChatGPT, who put her in touch with robotics experts when she was researching the role of Gemma. The film raises questions not only about the danger of rogue AI, but about the ethical concerns –including how we should feel about the "rights" of devices. "It's easy to imbue anything that has AI in it with humanity.