Doctor Who : The Macra Terror, Episode 3 (1967)
Directed by John Howard Davies
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Synopsis by Hal Erickson
In the third episode of the four-part story "The Macra Terror," the Doctor (Patrick Troughton), Polly (Annika Wills), and Jamie (Frazer Hines) are forced to work in the Macra salt mines. Here, the time travelers make a horrifying discovery: The crablike Macra intend to use a colony of earthlings as the main ingredient for a gas that is vital to the planet's survival. Written by Ian Stuart Black, "The Macra Terror, Episode 3" first aired on March 25, 1967. This episode apparently no longer exists.