The Doctor and Edgeworth deduce that the real plan of Mestor, the gastropod ruler of Jaconda, will not only destroy Jaconda but lead to the devastation of other planets. Together they hope to thwart him despite his formidable ability at slipping into people's minds and controlling them.
| Name | Type | Role | |
|---|---|---|---|
| Anthony Steven | Writer | ||
| Gavin Conrad | Guest Star | ||
| Maurice Denham | Guest Star | ||
| Kevin R. McNally | Guest Star | ||
| Barry Stanton | Guest Star | ||
| Oliver Smith | Guest Star | ||
| Andrew Conrad | Guest Star | ||
| Peter Moffatt | Director |