The barren planet Exxilon, some time in the future. The TARDIS is forced down by a total power failure and the Doctor and Sarah meet a stranded Earth crew who came here to mine for priceless medical supplies. But what is causing the power failures? And why have the Daleks come here too?
| Name | Type | Role | |
|---|---|---|---|
| Terry Nation | Writer | ||
| Neil Seiler | Guest Star | ||
| Mostyn Evans | Guest Star | ||
| Duncan Lamont | Guest Star | ||
| Joy Harrison | Guest Star | ||
| Julian Fox | Guest Star | ||
| Michael E. Briant | Director |