Harding Wellman was a mountaineer who was killed in an avalanche while climbing the Swiss Alps in 1913. He was commemorated in the Tremayne School chapel in Switzerland.
When the Fifth Doctor conducted a séance on 22 December 1963, he manifested as a physical being. He had epileptic fits which caused the poltergeist activity in the school. (AUDIO: Winter for the Adept)
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