In Tranquil Repose on Necros, Davros used the Glass Daleks as part of his experimentation. By placing a cryogenicaly-frozen head into the casing, the head would mutate into the deadly creatures that made up the Imperial Daleks. When the head had become another Dalek, the Glass Dalek casing changed into that of an Imperial Dalek and another glass casing took a new head.
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