UNIT have penetrated the heat barrier and launch an attack on the gargoyle, Bok. In the cavern, the Daemon Azal confronts the Doctor and the Master to decide the fate of mankind.
| Name | Type | Role | |
|---|---|---|---|
| Robert Sloman | Writer | ||
| Barry Letts | Writer | ||
| Matthew Corbett | Guest Star | ||
| Stanley Mason | Guest Star | ||
| John Owens | Guest Star | ||
| Christopher Barry | Director |