Doctor Who: Season 21, Episode 6
The Awakening: Part Two (20 Jan. 1984)
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.
Director:Michael Owen Morris
Writer:Eric Pringle (by)