M3GAN is a marvel of artificial intelligence, a lifelike doll that's programmed to be a child's greatest companion and a parent's greatest ally. Designed by Gemma, a brilliant roboticist, M3GAN can listen, watch, and learn as it plays the role of friend and teacher, playmate and protector. When Gemma becomes the unexpected caretaker of her eight-year-old niece, she decides to give the girl a M3GAN prototype, a decision that leads to unimaginable consequences....

Arriving at her new college, Beca finds herself not right for any clique but somehow is muscled into one that she never would have picked on her own: alongside mean girls, sweet girls and weird girls whose only thing in common is how good they sound when they sing together. When Beca leads this a cappella singing group out of their traditional arrangements and perfect harmonies into all-new mash-ups, they fight to climb their way to the top of college...