Castrovalva: Part Four
- Episode aired Jan 12, 1982
- TV-PG
- 24m
The Portreeve of Castrovalva is revealed to be the Master in disguise who, as the Doctor discovers, created Castrovalva himself to trap his newly regenerated arch-enemy.The Portreeve of Castrovalva is revealed to be the Master in disguise who, as the Doctor discovers, created Castrovalva himself to trap his newly regenerated arch-enemy.The Portreeve of Castrovalva is revealed to be the Master in disguise who, as the Doctor discovers, created Castrovalva himself to trap his newly regenerated arch-enemy.