Ian, Barbara and the Thals struggle through the caves to reach the Dalek city. Will they get there in time? Is there even a way through the treacherous caves? And what are the Daleks planning?
| Name | Type | Role | |
|---|---|---|---|
| Terry Nation | Writer | ||
| Peter Hawkins | Guest Star | ||
| Marcus Hammond | Guest Star | ||
| Katie Cashfield | Guest Star | ||
| Kevin Manser | Guest Star | ||
| Philip Bond | Guest Star | ||
| Alan Wheatley | Guest Star | ||
| Vez Delahunt | Guest Star | ||
| Michael Summerton | Guest Star | ||
| David Graham | Guest Star | ||
| Virginia Wetherell | Guest Star | ||
| Kevin Glenny | Guest Star | ||
| Jonathan Crane | Guest Star | ||
| Robert Jewell | Guest Star | ||
| John Lee | Guest Star | ||
| Ruth Harrison | Guest Star | ||
| Chris Browning | Guest Star | ||
| Gerald Taylor | Guest Star | ||
| Richard Martin | Director |