This final, six-part, instalment of the "Key to Time" series splits quite neatly into two stories, really. The first sees our travelling Time Lord (Tom Baker) and his colleague "Romana" (Mary Tamm) arrive on the planet of "Atrios" right in the middle of their war with the neighbouring "Zeos". Thus far it's proved a bit of a stalemate, but the "Marshal" (John Woodvine) reckons he has a plan that will prove decisive, despite the more pacifist hopes of his princess "Astra" (Lalla Ward). Meantime, though, the "Doctor" begins to wonder if someone else isn't pulling the strings here and when they stu...