The Malus, an alien that's purely evil, needs the civil war re-enactments to become authentic so it can feed off the psychic energy of dying and embattled men and fully revive. Not if the Doctor can derail things, of course.
Quest roles:
Polly James(Jane Hampden), Glyn Houston(Colonel Ben Wolsey), Denis Lill(Sir George Hutchinson), Jack Galloway(Joseph Willow), Keith Jayne(Will Chandler), Frederick Hall(Andrew Verney)