The Doctor, Chris and K9 race to rescue Romana from Skagra. Claire makes a startling discovery about the Professor's rooms.
| Name | Type | Role | |
|---|---|---|---|
| Douglas Adams | Writer | ||
| Geoffrey Bateman | Guest Star | ||
| David Daker | Guest Star | ||
| Barry Andrews | Guest Star | ||
| Annette Peters | Guest Star | ||
| Jennifer Lonsdale | Guest Star | ||
| Peter Craze | Guest Star | ||
| Lionel Sansby | Guest Star | ||
| Geoffrey Hinsliff | Guest Star | ||
| David Brierley | Guest Star | ||
| Peter Roberts | Guest Star | ||
| Lewis Fiander | Guest Star | ||
| Maggie Petersen | Guest Star | ||
| Pennant Roberts | Director |