The systemic conflict between Castrovalva’s inhabitants and the Master’s recursive domination, culminating in a sudden and collective assertion of agency by the town to resist psychological control.

Trapped in the tunnel beneath Castrovalva, the Doctor orders Mergrave to leave with him while the Master’s plan unravels. Castrovalva’s people seize the moment, dragging the Master back despite his …

The Doctor urges Mergrave to flee as Castrovalva’s corridors collapse under the strain of the Master’s zero structure. Adric seizes the Doctor’s arm and hauls him through the closing doors …