Saturday, 9th May 1970 5:15PM BBC 1 (23 mins)
UNIT are at a project run by Professor Stahlman who intends to penetrate Earth’s crust. But the drilling has already released something deadly from beneath the Earth’s surface.
Third Doctor
Liz Shaw
Alistair Gordon Lethbridge-Stewart
Greg Sutton
Petra Williams
John Benton
Harry Slocum
Bromley
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