In 17th century England, the Doctor and itinerant thespian Richard Mace uncover a plot by a crew of criminal Terileptils to wipe out humanity.
| Actor | Role |
|---|---|
 Peter DavisonThe Doctor | The Doctor |
 Matthew WaterhouseAdric | Adric |
 Sarah SuttonNyssa | Nyssa |
 Janet FieldingTegan Jovanka | Tegan Jovanka |
 Michael RobbinsRichard Mace | Richard Mace |
| MMichael MeliaTerileptil Leader | Terileptil Leader |
| PPeter van DisselAndroid | Android |
| JJames CharltonThe Miller | The Miller |
| NNeil WestThe Poacher | The Poacher |
| EEric DodsonThe Headman | The Headman |
 John SavidentThe Squire | The Squire |
 Anthony CalfCharles | Charles |
| JJohn BakerRalph | Ralph |
| VValerie FyferElizabeth | Elizabeth |
| RRichard HamptonVillager | Villager |
 David SummerTerileptil | Terileptil |
 Michael LeaderTerileptil | Terileptil |
| JJeff WayneScytheman | Scytheman |