The Doctor, Romana and K-9 arrive on the Empress where they meet the scientist Tryst who is transporting a device known as Continuous Event Transmuter (CET).[1]
| No of Episodes[2] | First Broadcast[2] | Writer(s)[2] | Script Editor(s)[2] |
|---|---|---|---|
| Four | November 24 - December 15, 1979 | Bob Baker | Douglas Adams |
| Director(s)[2] | Producer(s)[2] | ||
|---|---|---|---|
| Alan Bromly Graham Williams | Graham Williams |
| Episodes[3] | |||
|---|---|---|---|
| Episode One, broadcast November 24, 1979 | Episode Two, broadcast December 1, 1979 | Episode Three, December 8, 1979 | Episode Four, broadcast December 15, 1979 |
Notable Cast[2] | |||
|---|---|---|---|
Doctor Who - Tom Baker | Romana - Lalla Ward | K9 - David Brierley (voice) | |
| Guest Cast Members[2] | |||
|---|---|---|---|
| Rigg - david daker | Fisk - Geoffrey Hinsliff | Costa - Peter Craze | |