The Doctor becomes alarmed on seeing television coverage of an archaeological dig by a Professor Horner into an ancient barrow near the village of Devil's End. He hurries to the scene with Jo. The Master is posing as the local vicar, Mr Magister, and using black magic rituals to summon Azal, the last of a race known as the Dæmons, whose miniaturised spaceship is buried within the barrow. Benton and Yates arrive in a UNIT helicopter but, before the Brigadier and his troops can join them, a heat barrier appears and cuts the village off from the outside world.