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 | |
|---|---|---|---|
| Barry Letts | Writer | ||
| Robert Sloman | Writer | ||
| John Owens | Guest Star | ||
| Matthew Corbett | Guest Star | ||
| Stanley Mason | Guest Star | ||
| Christopher Barry | Director |