Marco, Tato, Serena, and Leo are nine years old, and they are inseparable friends, ready to defend each other from their schoolmates’ bullying. On the evening of Marco's birthday, all four find themselves together to blow out the candles and unknowingly make the same wish: become adults. In one night's time, they find themselves magically the same age as their parents, but with the same behaviour and thoughts they have as kids.
| Actor | Role |
|---|---|
 Enrico BrignanoMarco | Marco |
 Ilenia PastorelliSerena | Serena |
 Luca BizzarriLeo | Leo |
 Paolo KessisogluTato | Tato |
 Valeria BilelloFrancesca | Francesca |
 Claudia PotenzaAnna | Anna |
 Luca AngelettiCarlo | Carlo |
 Carlotta NatoliCommissaria | Commissaria |
 Marco MesseriNonno | Nonno |
 Valeria FabriziNonna | Nonna |
| LLeone CardaciTato bambino | Tato bambino |
| DDaniel PernicianoLeo bambino | Leo bambino |
| AAlyssa PalmeseFrancesca bambina | Francesca bambina |
| MMattia ManfredoniaMarco bambino | Marco bambino |
| IIlary ManciniSilvietta | Silvietta |
 Gabriele PignottaClaudio | Claudio |
 Francesca NerozziMilena | Milena |
 Ubaldo PantaniPreside | Preside |
| FFrancesco MitidieriIvan | Ivan |
| SSettimo PalazzoAgente Lo Cascio | Agente Lo Cascio |
| FFederico NanniFausto | Fausto |
| LLaura CanaleBidella | Bidella |
| AAlice SimoniSerena bambina | Serena bambina |
 Marco ZingaroFilippo | Filippo |
| TTeresa FedericoAmica Francesca | Amica Francesca |
 Fabrizio NardiCommesso di giocattoli | Commesso di giocattoli |
 Valentina RuggeriPassante | Passante |
| GGianmarco RussoPinuccio | Pinuccio |