The Ship contains a generation, and only one inheritor knows what must be done when the tremor is felt throughout the metal cylinder.
| Actor | Role |
|---|---|
 David BuckJon Hoff | Jon Hoff |
 Ronald LaceyJoe Manx | Joe Manx |
| OOwen BerryJoshua | Joshua |
 Suzan FarmerMary Hoff | Mary Hoff |
 Toke TownleyMartin | Martin |
| MMichael McGovernGeorge | George |
 Ruth KettlewellMrs. Kane | Mrs. Kane |
| GGodfrey KentonJohn's Father | John's Father |
| GGary SmithJohn (as a boy) | John (as a boy) |