The Doctor and UNIT investigate a deadly infection lurking underneath the Welsh mining town of Llanfairfach. It's an adventure that will change Jo Grant's life forever...

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Main Cast: Jon Pertwee, Katy Manning, Nicholas Courtney, John Levene, Richard Franklin, Stewart Bevan, Jerome Willis, Tony Adams, Ben Howard, Mostyn Evans

Director: Michael E. Briant

Writer: Robert Sloman

Editor: Alastair Mackay

Cinematographer:

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