The Doctor makes the fugitive Terileptils a rare offer they shouldn't refuse; but, though few in numbers, they have a plan in the works for the quick and complete domination of Earth and mean to see it through.
| Name | Type | Role | |
|---|---|---|---|
| Eric Saward | Writer | ||
| James Charlton (Miller) | Guest Star | ||
| Michael Melia (Terileptil) | Guest Star | ||
| Neil West (Poacher) | Guest Star | ||
| Peter Van Dissel | Guest Star | ||
| Michael Robbins (Richard Mace) | Guest Star | ||
| Anthony Calf | Guest Star | ||
| John Savident | Guest Star | ||
| Eric Dodson (Headman) | Guest Star | ||
| Valerie Fyfer (Elizabeth) | Guest Star | ||
| John Baker | Guest Star | ||
| Peter Moffatt | Director |