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.