A robotics engineer at a toy company builds a life-like doll that begins to take on a life of its own.
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 young woman is forced to return to her childhood home after being placed under house arrest, where she suspects that something evil may be lurking.