Five inseparable friends, the Wonderboys, are forced to say goodbye because the Old Hag, the owner of their apartments, is about to sell their homes in exchange for a Maradona figurine. When the figurine is stolen by their idol Tonino Wonderboy, the new Munaciello of Naples, their adventure begins in the city's underground, in search of a mysterious treasure.

A 5-year-old, with the help of her amazing teacher and new friends, uses her imagination to express her fears, excitement, and joy through big stage musical-style song and dance numbers.