On the eve of May Day, dark elemental forces begin to disturb the village of Devil's End as the Master summons the demon Azal: unexplained murders, a stone gargoyle come to life, and a nigh-impenetrable infernal energy dome. With the Master fully prepared to destroy the Earth, the Doctor and UNIT - aided by a benevolent practitioner of witchcraft - battle the wicked rites of a secret science wielded by an alien from another world.
Social & External

The Doctor

Jo Grant

Brigadier Lethbridge-Stewart

Captain Mike Yates

Sergeant Benton

The Master

Azal

Bok
Miss Hawthorne

Bert the Landlord

Winstanley
Prof. Horner
Alastair Fergus

Harry
Garvin
Dr. Reeves
Tom Girton
PC Groom
Baker's Man

Sgt. Osgood
Thorpe

Jones
