A year has passed since Matthew said goodbye to his alien friend, and in the summer holidays he meets Albertine, a mathematical prodigy, with whom he discovers he can communicate telepathically. One day Chocky returns to warn Matthew that they are both in danger. When he returns to tell Albertine, he finds she has disappeared.
| Actor | Role |
|---|---|
 Andrew EllamsMatthew Gore | Matthew Gore |
| AAngela GalbraithAunt Cissie | Aunt Cissie |
| MMichael CromptonLuke | Luke |
| AAnabel WorrellAlbertine Meyer | Albertine Meyer |
 Prentis HancockArnold Meyer | Arnold Meyer |
 Ed BishopDr. Deacon | Dr. Deacon |
 Glynis BrooksChocky | Chocky |
 James HazeldineDavid Gore | David Gore |
 Jeremy BullochLandis | Landis |
 Brian de SalvoDoctor | Doctor |
 Carol DrinkwaterMary Gore | Mary Gore |
| ZZoë HartPolly Gore | Polly Gore |
 Sidney LivingstonePolice Sergeant | Police Sergeant |