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.

Jon Pertwee
as The Doctor

Katy Manning
as Jo Grant

Nicholas Courtney
as Brigadier Lethbridge-Stewart

Richard Franklin
as Captain Mike Yates

John Levene
as Sergeant Benton

Roger Delgado
as The Master

Stephen Thorne
as Azal

Stanley Mason
as Bok

Damaris Hayman
as Miss Hawthorne

Don McKillop
as Bert the Landlord
CinemaSerf
The entertaining Damaris Hayman brings something of the eccentric Margaret Rutherford to this enjoyable series as she claims to be an white witch ("Hawthorne") warning of great dangers should the pompous "Prof. Horner" (Robin Wentworth) go ahead with uncovering a tomb long since hidden near the mena...