Gemma, a roboticist at a toy company, creates M3GAN (Model 3 Generative Android) to be a companion and protector for children. When Gemma becomes the caretaker of her orphaned nieces, Cady and (Y/n) she gives them the M3GAN prototype. However, M3GAN's programming works too well, and she becomes overprotective of Cady and (Y/n)All Rights Reserved