Ann escapes her Harlequin-clad abductor but it's The Doctor whom she accuses. Strangled bodies mount and The Doctor is arrested along with "accessories" Tegan, Nyssa and Adric. Will Lady Cranleigh's secret come out?
| Name | Type | Role | |
|---|---|---|---|
| Terence Dudley | Writer | ||
| Sarah Sutton | Guest Star | Ann | |
| Moray Watson | Guest Star | Sir Robert Muir | |
| Andrew Tourell | Guest Star | Constable Cummings | |
| Brian Hawksley | Guest Star | Brewster | |
| Barbara Murray | Guest Star | Lady Cranleigh | |
| Ahmed Khalil | Guest Star | Latoni | |
| Michael Cochrane | Guest Star | Lord Cranleigh | |
| Timothy Block | Guest Star | Tanner | |
| Ivor Salter | Guest Star | Sergeant Markham | |
| Ron Jones | Director |