Doctor Who # 54 - Sontaran Experiment

London: W.H. Allen & Co. - Target, 1982. Third Printing . Mass Market Paperback. Very Good. 127 Pages. Some minor stains and scuffs to back cover. Otherwise a tight bright book with no marks or stamps. Landing on Earth, now a barren, desolate planet, Sarah, Harry and the Doctor are unaware of the large, watching robot. The robot is the work of Styre, a Sontaran warrior, who uses all humans, landing here for his experimental programmes. What has happened to the other space explorers who have come here? Why is the Sontaran scout so interested in Earth and in brutally torturing humans, including Sarah Jane? Will the Doctor be able to prevent an invasion and certain disaster, and save both Earth and his companions? Contents in 8 Chapters: Stranded, Unknown Enemies, Capture, The Experiment, Mistaken Identities, The Challenge, Duel to the Death, and A Surprise and a Triumph.