Doctor Who - The Mind of Evil (5)

Seizoen: 8 - Aflevering: 9 / 288 - Eerst uitgezonden: 27 februari 1971 - Episode ID: 75793

Earth, the near future. The Doctor visits Stangmoor Prison to see the Keller Machine, a revolutionary new type of rehabilitation aid, in action - but finds his fellow observers literally dying of fear. Who is responsible for creating the Machine? And how does it connect to the peace conference happening in London?