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Narrated by: Full Cast, Jon Pertwee, Katy Manning

Unabridged — 2 hours, 38 minutes

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Overview

Jon Pertwee stars as the third Doctor in this soundtrack of an exciting BBC TV adventure, with linking narration by Richard Franklin. A dangerous adventure begins for the Doctor and Jo Grant when they visit Strangmoor Prison for a demonstration of the new Keller Machine. The device is said to extract negative emotions from convicted prisoners, leaving them pacified and reformed. But when it apparently goes wrong, a far more sinister purpose is revealed... The Doctor's old enemy, the Master,...