The Scorpio, rendered inaccessible by an elaborate security system, is stolen by a native of the planet who seeks to escape. Avon completes the Scorpio teleport system with the help of Orac.
| Name | Type | Role | |
|---|---|---|---|
| Ben Steed | Writer | ||
| Linda Barr | Guest Star | ||
| Dicken Ashworth | Guest Star | ||
| Jenny Oulton | Guest Star | ||
| Juliet Hammond | Guest Star | ||
| Paul Ridley | Guest Star | ||
| Alison Glennie | Guest Star | ||
| Mary Ridge | Director |