John (The Sensorites)

John was a mineralogist on Captain Maitland's ship. During the expedition to the Sense Sphere, he found the planet was rich in molybdenum, forcing the Sensorites to attack his mind. Unlike Maitland and Carol, who were put in a deep sleep resembling death, John's mind was opened and became insane. Along with the rest of the crew, he was held prisoner on their ship. His mind was eventually restored, and he was allowed to return to Earth after promising to keep the Sensorites' existence secret. (TV: The Sensorites)