The Ultra City Smiths story unfolds via the stop-motion animation of baby dolls repurposed as a grown-up cast of characters. The series hinges on an investigation into the mysterious disappearance of fictional metropolis Ultra City's most famous magnate. Two intrepid detectives follow the case, rallying to fight against their city's dangerous corruption, at a high cost to themselves and their families, all in pursuit of a gentler place to call home....