The Doctor attempts to help the Brigadier penetrate the heat barrier, but is attacked by the Master's servant in a helicopter. The Master prepares to summon the Daemon Azal.
| Name | Type | Role | |
|---|---|---|---|
| Robert Sloman, Barry Letts | Writer | ||
| Stanley Mason | Guest Star | ||
| Rollo Gamble | Guest Star | ||
| Eric Hillyard | Guest Star | ||
| Jon Croft | Guest Star | ||
| John Owens | Guest Star | ||
| Christopher Barry | Director |