The possessed Tegan and Lon try to find the whereabouts of the Great Crystal. The Doctor finds himself in prison, with only Nyssa to try and get him out. Chela tells the Doctor tales of Dojjen.
| Name | Type | Role | |
|---|---|---|---|
| Chris Bailey | Writer | ||
| Colette O'Neil | Guest Star | ||
| Jonathon Morris | Guest Star | ||
| Preston Lockwood | Guest Star | ||
| Barry Smith | Guest Star | ||
| John Carson | Guest Star | ||
| Martin Clunes | Guest Star | ||
| Fiona Cumming | Director |