Doctor Who : the Sontaran experiment [DVD] / British Broadcasting Corporation ; 2 Entertain Video Limited ; produced by Philip Hinchcliffe ; written by Bob Baker and Dave Martin ; directed by Rodney Bennett.
Tom Baker, Elisabeth Sladen, Ian Marter. Originally broadcast on BBC television from Feb. 22-Mar. 1, 1975. Special features: Audio commentary by actress Elisabeth Sladen, co-writer Bob Baker and producer Philip Hinchcliffe; "Built for war": a 39-min. documentary on the genesis and development of the Sontaran race through the history of the series; production notes; photo gallery.
Summary:
Transmitting down from Nerva Beacon, the Doctor, Sarah Jane and Harry find themselves on Earth in the far future, long since abandoned by the human race. Soon it becomes clear that they are not alone: a shipwrecked crew of human astronauts are being hunted down, one by one. What is the creature that lives in the rocks, and what is the purpose of the lethal tests it is conducting? Can the Doctor ensure the safety of the Earth for the future generations of humankind?
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