Plot
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...
| Writer | Robert Sloman |
|---|---|
| Director | Michael E. Briant |
| Actor | Jon Pertwee, Katy Manning, Nicholas Courtney |
| Country | United Kingdom |
| Production | BBC |
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