Damaris Hayman

The Doctor tries to prevent Professor Horner from breaking into an ancient barrow near the village of Devil's End. Posing as the village vicar, the Master summons dark forces.

Devil's End is sealed off from the outside world by a heat barrier. The Doctor and Jo return to the barrow where they are confronted by the gargoyle, Bok.

UNIT have penetrated the heat barrier and launch an attack on the gargoyle, Bok. In the cavern, the Daemon Azal confronts the Doctor and the Master to decide the fate of mankind.

The Doctor is captured by the villagers who are under the Master's control. Jo goes to the church to prevent the Master from summoning Azal for the final time, but is too late.

The Doctor attempts to help the Brigadier penetrate the heat barrier but is attacked by the Master's servant in a helicopter. The Master prepares to summon the Daemon Azal.