Answers come think and fast, but no explanation can prepare the Doctor, Chris and K9 for what they find on Shada.
| Name | Type | Role | |
|---|---|---|---|
| Douglas Adams | Writer | ||
| Barry Andrews | Guest Star | ||
| Geoffrey Hinsliff | Guest Star | ||
| Peter Craze | Guest Star | ||
| Richard Barnes | Guest Star | ||
| Maggie Petersen | Guest Star | ||
| Sebastian Stride | Guest Star | ||
| David Brierley | Guest Star | ||
| Lewis Fiander | Guest Star | ||
| David Daker | Guest Star | ||
| Geoffrey Bateman | Guest Star | ||
| Pennant Roberts | Director |