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b'The Doctor and Romana approach the end of their search for the Key to Time but their hopes of an easy resolution are dashed when they find themselves in the midst of an interplanetary war. \\nThis week, Paddy and Tricia watch as The Doctor and his friends come face to face with another force seeking the Key for their own desires. Can they complete their objective and save two planets about to be destroyed by The Armageddon Factor?'