Earth, the near future. The Master – another renegade Time Lord and the Doctor's sworn enemy – arrives and allies himself with the Nestene Consciousness in an attempt to conquer the planet.
| Name | Type | Role | |
|---|---|---|---|
| Robert Holmes | Writer | ||
| John Baskcomb | Guest Star | ||
| Harry Towb | Guest Star | ||
| Frank Mills | Guest Star | ||
| Barry Letts | Director |