Note: Audio reading of Ian Marter's 1978 novelisation.
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Landing on Earth — now a barren, desolate planet — Sarah, Harry and the Doctor are unaware of a large, watching robot. The robot is the work of Styr, 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 Styr so interested in Earth, and in brutally torturing humans, including Sarah Jane?
Will the Doctor be able to prevent an invasion, and save both Earth and his companions?
Jon Culshaw reads this complete and unabridged novelisation by Ian Marter (who played Harry Sullivan in the original TV series) first published by Target Books in 1978.