Martino is a young child who claims to have an invisible friend called Luca. His parents assume it is just a game, but strange things start to happen.
| Actor | Role |
|---|---|
 John Phillip LawAlex | Alex |
 Nathalie DelonCamilla | Camilla |
| OOlga BiseraFrançoise | Françoise |
| AAlessandro PoggiMartino | Martino |
 Joseph CottenThe Professor | The Professor |
 Lucretia LoveSusan | Susan |
 Adriana RussoClara | Clara |
 Zora VelcovaCamilla's Mother | Camilla's Mother |
| MMargherita SalaNot listed | Not listed |
| SSusanna MelandriMilena | Milena |
 Simona PatitucciMatilde | Matilde |
| CClaudio CirilloDetective | Detective |