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- (1970)
- Starring: Jon Pertwee, Caroline John
- Genre: TV Sci-Fi, British-Television
- Studio: BBC Archives
- Release Date: 3/16/2021
- Features: Manufactured on Demand, Special Edition
- Jon Pertwee, Caroline John, Nicholas Courtney. When a new energy source is discovered deep inside the Earth, the Doctor is concerned that drilling to retrieve it will unleash a dangerous gas into the... more