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.

During a blizzard and stranded at an isolated highway rest stop in the mountains, a college student discovers a kidnapped child hidden in a car belonging to one of the people inside.