Designed by brilliant toy-company roboticist Gemma (Allison Williams), M3GAN is a marvel of artificial intelligence, a life-like doll programmed to be the best possible friend and teacher, playmate and protector for the child she is bonded to.

After a tragic car accident, Gemma suddenly find herself responsible for her orphaned 8-year-old niece, Cady (Violet McGraw). Daunted by the prospect of parenthood and under intense pressure at work, Gemma decides to pair her M3GAN prototype with Cady in an attempt to resolve both problems – a decision that will have unimaginable consequences in this unapologetically campy and entertaining horror-comedy.