A course change that takes the Hyperion III closer to a black hole could prove unwise when there are so many aboard ship with hidden agendas. Disappearances continue, a murderer remains at large, and one person finally crumbles under the strain of harbouring a guilty secret.
| Name | Type | Role | |
|---|---|---|---|
| Pip Baker, Jane Baker | Writer | ||
| Sam Howard | Guest Star | ||
| Honor Blackman | Guest Star | ||
| Denys Hawthorne | Guest Star | ||
| Hugh Beverton | Guest Star | ||
| Barbara Ward | Guest Star | ||
| Bob Appleby | Guest Star | ||
| Malcolm Tierney | Guest Star | ||
| Peppi Borza | Guest Star | ||
| Yolande Palfrey | Guest Star | ||
| Leon Davis | Guest Star | ||
| Michael Craig | Guest Star | ||
| Chris Clough | Director |