Two years after M3GAN's rampage, her creator, Gemma, resorts to resurrecting her infamous creation in order to take down Amelia, the military-grade weapon who was built by a defense contractor who stole M3GAN's underlying tech.

A brilliant toy company roboticist uses artificial intelligence to develop M3GAN, a life-like doll programmed to emotionally bond with her newly orphaned niece. But when the doll's programming works too well, she becomes overprotective of her new friend with terrifying results.

Kylie Bucknell is forced to return to the house she grew up in when the court places her on home detention. Her punishment is made all the more unbearable by the fact she has to live there with her mother Miriam - a well-intentioned blabbermouth who's convinced that the house is haunted. Kylie dismisses Miriam's superstitions as nothing more than a distraction from a life occupied by boiled vegetables & small-town gossip. However, when she too becomes privy to unsettling whispers & strange bumps in the night, she begins to wonder whether she's inherited her overactive imagination, or if the house is in fact possessed by a hostile spirit who's less than happy about the new living arrangement.