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In the third episode of the four-part story "The Mask of Mandragora," the Doctor (Tom Baker) remains in Renaissance Italy, where the Brotherhood of Demnos, acting under orders from the Mandragora Helix, continue in their efforts to take over the world. As the Powers of Darkness envelope the earth, the Doctor is imprisoned and subjected to the most hideous of tortures -- while Sarah (Elisabeth Sladen) is prepared for human sacrifice. Originally telecast on September 18, 1976, "The Mask of Mandragora, Episode 3" was written by Terrance Dicks.