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Name – John
Species – Human
Planet – Earth
Temperament – Deranged, but courageous
Appearances – The Sensorites

John has lost his mind. He has been more badly affected by the telepathic minds of the Sensorites than the others. He finds it impossible to turn off their voices in his mind and knows there are some that wish him harm. When the Sensorites offer to heal him he makes good progress, but is still convinced of an evil in the city. Once the City Administrator and Engineer have been captured he is quickly cured.