Fran, fresh out of her job as a bridal consultant in her boyfriend’s shop, first appears on the doorstep of Broadway producer Maxwell Sheffield peddling cosmetics, and quickly stumbled upon the opportunity to become The Nanny for his three children. But soon Fran, with her offbeat nurturing and no-nonsense honesty, touches Maxwell as well as the kids.

In the future, mental institutions are located on far-away planets. One such planet is the apex for an invasion of Earth by rodent-like aliens. It is up to a band of intrepid mental patients to thwart their evil schemes.