Chocky hopes, with Matthew and Albertine's help, to help the human race discover cosmic power, which unlike Earth's finite natural resources, will sustain them for as long as the universe itself exists. But their knowledge has aroused a great deal of interest from the military, and they are willing to take drastic action if they don't get what they want.
| Actor | Role |
|---|---|
 Prentis HancockArnold Meyer | Arnold Meyer |
| AAnabel WorrellAlbertine Meyer | Albertine Meyer |
| IIllona LinthwaiteDr. Liddle | Dr. Liddle |
 Joan BlackhamMrs. Gibson | Mrs. Gibson |
 Glynis BrooksChocky | Chocky |
| PPaul RussellPaul Barclay | Paul Barclay |
| FFreddie BrooksMike | Mike |
| KKarina WilsherSu Lin | Su Lin |
 Richard WordsworthProfessor Ferris | Professor Ferris |
| KKristine HowarthProfessor Wade | Professor Wade |
| LLeon EaglesGeneral | General |
 Roy BoydProfessor Draycott | Professor Draycott |
 Andrew EllamsMatthew Gore | Matthew Gore |
 James HazeldineDavid Gore | David Gore |
| NNorma RonaldChocky's Parent | Chocky's Parent |
| PPaul ShearerReporter | Reporter |
| MMichael PlaisterPorter | Porter |