The Doctor, Barbara and Susan make their way out of London to the Daleks' mining operation in Bedfordshire whilst Ian faces the Black Dalek's pet Slyther.
| Name | Type | Role | |
|---|---|---|---|
| Terry Nation | Writer | ||
| Graham Rigby | Guest Star | ||
| Patrick O'Connell | Guest Star | ||
| Alan Judd | Guest Star | ||
| Nicholas Smith | Guest Star | ||
| Richard Martin | Director |