The Doctor and his companions arrive at a medieval joust and are surprised to be greeted warmly by King John, who calls them his demons. But when a young nobleman returns, having just left King John in London, the Doctor realises that this king must be an impostor! Then the Master makes an appearance and the Doctor's worst fears are confirmed...
| Actor | Role |
|---|---|
 Peter DavisonThe Doctor | The Doctor |
 Janet FieldingTegan Jovanka | Tegan Jovanka |
 Mark StricksonVislor Turlough | Vislor Turlough |
 Gerald FloodKing John / Kamelion (voice) | King John / Kamelion (voice) |
 Anthony AinleyThe Master / Sir Gilles Estram | The Master / Sir Gilles Estram |
 Frank WindsorRanulf | Ranulf |
 Christopher VilliersHugh | Hugh |
 Isla BlairIsabella | Isabella |
 Michael J. JacksonSir Geoffrey de Lacey | Sir Geoffrey de Lacey |
 Peter BurroughsJester | Jester |
| JJakob LindbergLutenist | Lutenist |