When Mr. Burns' assistant Waylon Smithers botches his getaway from a jewelry heist, a collision with Homer Simpson sends a stolen diamond tumbling into the hands—or rather, mouth—of baby Maggie. Smithers absconds with the infant, forcing her family to pursue him through Springfield despite overwhelming odds, as Burns deploys wave after wave of hired muscle to keep them from reclaiming their daughter. What begins as a simple case of mistaken possession spirals into a desperate rescue mission against a crime boss's seemingly endless army of thugs and lackeys.