Tom Baker stars as the enigmatic Time Lord in this classic two-part adventure. Arriving on a seemingly deserted Earth, the Doctor, Sarah (Elisabeth Sladen) and Harry (Ian Marter) soon discover a crew of shipwrecked astronauts from a distant Earth colony. Lured there by a fake distress call, the astronauts are being experimented on by the deadly Sontarans in preparation of a full-scale invasion of the planet. Can the Doctor defeat Sontaran Field-Marshall Styre (Kevin Lindsay) and save the world?
* Audio Commentary with Elisabeth Sladen, Bob Baker and Philip Hinchcliffe
* Documentary - Built for War. A brief history of the Sontaran race, told by some of the actors and production personnel who worked on the stories, including Elisabeth Sladen, stuntman Stuart Fell, writer Bob Baker and more
* Photo gallery
* Production notes
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