The Doctor and the Brigadier attempt to rescue Jo and Bert from the mine but Global Chemicals prove distinctly uncooperative.
| Name | Type | Role | |
|---|---|---|---|
| Robert Sloman, Barry Letts | Writer | ||
| Ben Howard | Guest Star | ||
| Tony Adams | Guest Star | ||
| Talfryn Thomas | Guest Star | ||
| Mostyn Evans | Guest Star | ||
| Michael E. Briant | Director |