): Beware the Black Guardian. And clever. Come on. DE VRIES: A key to what? DOCTOR: Have I got a treat in store for you, Romana. DOCTOR: The voice you just heard and the being you saw in the shape of the President was the White Guardian, or to be more accurate, the Guardian of Light and Time as opposed to the Guardian of Darkness, sometimes called the Black Guardian. DOCTOR: These are. ROMANA: Earth? ROMANA: Just like the segment of the key. ROMANA: Why strange? We've landed. Where are you?
Plan: A: Earth; Q: Where do the Doctor and Romana land on in their search for the 3rd segment of the key to time? A: worshipers; Q: Who are engaged in their practice at the Stonehenge type site? A: unknown causes; Q: What are people being killed by at Stonehenge? A: a strange voice; Q: What do the Doctor and Romana hear while en route to Stonehenge? A: the Black Guardian; Q: What does the voice warn the Doctor and Romana to beware of? Summary: In their search for the 3rd segment of the key to time, the Doctor and Romana land on Earth at a Stonehenge type site where worshipers are engaged in their practice and people are being killed by unknown causes. While en route the Doctor and Romana hear a strange voice that says 'Beware the Black Guardian".