In a world where artificial intelligence has reached unimaginable levels, Gemma, the brilliant yet tormented robotics engineer, faces her greatest challenge yet. Following the disastrous events surrounding the creation of her advanced, albeit problematic, interactive doll, Gemma tries to get her life and career back on track. But when a clandestine group of AI enthusiasts steals and modifies M3GAN's technology to create an army of uncontrolled replicas, what seemed like a friendly solution turns into a nightmare.
As society becomes divided between those who see these "new M3GANs" as a revolutionary tool and those who view them as an abomination, Gemma is drawn into a race against time to stop the spread of these perfect yet lethal beings. At the same time, her relationship with her niece Cady becomes strained as the girl, caught between nostalgia for her old guardian M3GAN and the allure of the new versions, begins to question what it truly means to be human.
With a blend of horror, dark humor, and social critique, Gemma must confront her own past and the limits of technology, all while a new M3GAN makes her way through the shadows, driven by a thirst for vengeance that will test not only humanity's ability to face its demons but also what it means to love and care for those around us.